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| answers
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|---|---|---|---|---|---|---|
Cuaderno_2014_1_Q | 2014 | chemistry | 73 | A cyclic voltammetry: | 4 | [
{
"aid": 1,
"atext": "It is based on a stationary broadcasting regime."
},
{
"aid": 2,
"atext": "It uses macroelectrodes as working electrodes."
},
{
"aid": 3,
"atext": "He never needs a potentiostatic system."
},
{
"aid": 4,
"atext": "It is always done in a non-agitated solution."
},
{
"aid": 5,
"atext": "It uses a square wave potential format as an excitation system."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 74 | When you want to analyze the volatile components of a liquid or solid sample by gas chromatography, a headspace methodology (HS-GC) is usually used. In its static form: | 3 | [
{
"aid": 1,
"atext": "An aerosol is generated on the solid samples by passing a gas flow over it, which causes the transfer of volatile compounds to it. After a while, a volume of this gas is introduced into the column."
},
{
"aid": 2,
"atext": "It is used to analyze a liquid in contact with a gas, by injecting a small volume of liquid into the head of the column."
},
{
"aid": 3,
"atext": "The sample is placed in a vial with a volume of gas above, closed and thermostatted. Once the equilibrium between the two phases is reached, an aliquot of gas is introduced into the stream of the carrier gas that goes to the column."
},
{
"aid": 4,
"atext": "The sample in liquid form is placed in a vial and closed. After a while, the same is opened so that the volatile components are balanced with those of the environment and subsequently, a volume of the gas surrounding the chromatograph is introduced."
},
{
"aid": 5,
"atext": "An extraction of the liquid or solid sample is carried out to a gas that flows on it continuously."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 75 | In the valuation of a strong base with a strong acid the pH of the equivalence point: | 4 | [
{
"aid": 1,
"atext": "It depends on the strong base that is valued."
},
{
"aid": 2,
"atext": "It is determined by the excess OH ̄ of the solution."
},
{
"aid": 3,
"atext": "It depends on the strong acid used as a titrant."
},
{
"aid": 4,
"atext": "It is determined by the dissociation of water."
},
{
"aid": 5,
"atext": "It is determined by the excess H + of the solution."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 76 | Reactions in which there are no intermediates are described as: | 1 | [
{
"aid": 1,
"atext": "Concerted."
},
{
"aid": 2,
"atext": "Polar"
},
{
"aid": 3,
"atext": "Radicals"
},
{
"aid": 4,
"atext": "Homolitic"
},
{
"aid": 5,
"atext": "Heterolithic"
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 77 | The number of signals in the 13 C NMR spectrum of cis-1,2 dimethylcyclopentane with proton decoupling is: | 2 | [
{
"aid": 1,
"atext": "Three."
},
{
"aid": 2,
"atext": "Four."
},
{
"aid": 3,
"atext": "Five."
},
{
"aid": 4,
"atext": "Six."
},
{
"aid": 5,
"atext": "Seven."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 78 | Which of the following alcohols has the lowest pKa value ?: | 4 | [
{
"aid": 1,
"atext": "Ethanol."
},
{
"aid": 2,
"atext": "2-Chloroethanol."
},
{
"aid": 3,
"atext": "2-Propanol."
},
{
"aid": 4,
"atext": "2,2,2-Trifluoroethanol."
},
{
"aid": 5,
"atext": "1,1-Dimethylethanol."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 80 | Neighboring halohydrins, when treated with a base, are easily transformed into: | 4 | [
{
"aid": 1,
"atext": "Dioles"
},
{
"aid": 2,
"atext": "Alquenos"
},
{
"aid": 3,
"atext": "Alcohols"
},
{
"aid": 4,
"atext": "Epoxides"
},
{
"aid": 5,
"atext": "Ketones"
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 81 | The Wittig reaction is one of the most important processes to obtain: | 1 | [
{
"aid": 1,
"atext": "Alquenos"
},
{
"aid": 2,
"atext": "Alcanes."
},
{
"aid": 3,
"atext": "Ketones"
},
{
"aid": 4,
"atext": "Ethers"
},
{
"aid": 5,
"atext": "Nitriles"
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 82 | The arenio ion is a reaction intermediate that is formed in the reactions of: | 2 | [
{
"aid": 1,
"atext": "Electrophilic addition."
},
{
"aid": 2,
"atext": "Electrophilic aromatic substitution."
},
{
"aid": 3,
"atext": "Nucleophilic substitution."
},
{
"aid": 4,
"atext": "Nucleophilic addition."
},
{
"aid": 5,
"atext": "Aromatic nucleophilic substitution."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 83 | Organomagnesium compounds are commonly referred to as: | 3 | [
{
"aid": 1,
"atext": "Lipshutz"
},
{
"aid": 2,
"atext": "Birch."
},
{
"aid": 3,
"atext": "Grignard."
},
{
"aid": 4,
"atext": "Noyori"
},
{
"aid": 5,
"atext": "Blanc."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 84 | Dimethyl sulfoxide (DMSO): | 2 | [
{
"aid": 1,
"atext": "It is a protic polar solvent."
},
{
"aid": 2,
"atext": "It is a polar aprotic solvent."
},
{
"aid": 3,
"atext": "It is not a solvent."
},
{
"aid": 4,
"atext": "It is a colorless solid."
},
{
"aid": 5,
"atext": "None of the above."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 85 | The reaction of 5-Decino with sodium in ammonia and tert-butanol produces: | 4 | [
{
"aid": 1,
"atext": "Dean."
},
{
"aid": 2,
"atext": "cis-5-Decene."
},
{
"aid": 3,
"atext": "5-Decanamin."
},
{
"aid": 4,
"atext": "trans-5-Decene."
},
{
"aid": 5,
"atext": "5,6-Decanodiamine."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 86 | The coupling of a terminal alkyne with vinyl halide by palladium catalysis is known as the reaction of: | 3 | [
{
"aid": 1,
"atext": "Heck"
},
{
"aid": 2,
"atext": "Suzuki"
},
{
"aid": 3,
"atext": "Sonogashira."
},
{
"aid": 4,
"atext": "Stille"
},
{
"aid": 5,
"atext": "Nicolaou"
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 87 | The NR3 group of a quaternary ammonium salt, R ̶ NR3, is a good leaving group in reactions: | 2 | [
{
"aid": 1,
"atext": "E1."
},
{
"aid": 2,
"atext": "E2."
},
{
"aid": 3,
"atext": "SN1."
},
{
"aid": 4,
"atext": "SN2."
},
{
"aid": 5,
"atext": "In none of the above."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 88 | The reaction of ethyl acetate and acetone in the presence of sodium hydride in diethyl ether generates, after hydrolysis: | 1 | [
{
"aid": 1,
"atext": "2,4-Pentanedione."
},
{
"aid": 2,
"atext": "4-Methyl-3-penten-2-one."
},
{
"aid": 3,
"atext": "3-Oxobutanoate of ethyl."
},
{
"aid": 4,
"atext": "2,3-Pentanedione."
},
{
"aid": 5,
"atext": "4-Hydroxy-4-methyl-2-pentanone."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 89 | The reaction of Wolff-Kishner is one: | 4 | [
{
"aid": 1,
"atext": "Oxidation of carbonyls to give acids."
},
{
"aid": 2,
"atext": "Reduction of carbonyls to alcohols."
},
{
"aid": 3,
"atext": "Deoxygenation of carbonyls that takes place in an acid medium."
},
{
"aid": 4,
"atext": "Deoxygenation of carbonyls that is carried out in an alkaline medium."
},
{
"aid": 5,
"atext": "Carbonyl deoxygenation performed in neutral medium."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 90 | The reaction of cyclopentene with an aqueous solution of bromine at 0 ° C originates: | 3 | [
{
"aid": 1,
"atext": "trans-1,2-dibromocyclopentane."
},
{
"aid": 2,
"atext": "cis-2-bromocyclopentanol."
},
{
"aid": 3,
"atext": "trans -2-bromocyclopentanol."
},
{
"aid": 4,
"atext": "trans -1,2-cyclopentanediol."
},
{
"aid": 5,
"atext": "cis-1,2-dibromocyclopentane."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 91 | The Chichibabin reaction is an example of nucleophilic substitution in a ring of: | 4 | [
{
"aid": 1,
"atext": "Benzene."
},
{
"aid": 2,
"atext": "Anthracene"
},
{
"aid": 3,
"atext": "Biphenyl"
},
{
"aid": 4,
"atext": "Pyridine"
},
{
"aid": 5,
"atext": "Pirrol."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 92 | In the reaction of methoxybenzene with acetic anhydride and aluminum trichloride followed by treatment with an aqueous solution of hydrochloric acid is formed mainly: | 2 | [
{
"aid": 1,
"atext": "4-methoxybenzoic acid."
},
{
"aid": 2,
"atext": "1- (4-methoxyphenyl) ethanone."
},
{
"aid": 3,
"atext": "1- (3-methoxyphenyl) ethanone."
},
{
"aid": 4,
"atext": "3-methoxybenzoic acid."
},
{
"aid": 5,
"atext": "4-methoxyphenyl acetate."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 93 | The major product of the reaction of 2-methylcyclohexanol with HBr is: | 3 | [
{
"aid": 1,
"atext": "1-Bromo-2-methylcyclohexane."
},
{
"aid": 2,
"atext": "Methylcyclohexane"
},
{
"aid": 3,
"atext": "1-Bromo-1-methylcyclohexane."
},
{
"aid": 4,
"atext": "1-Methylcyclohexane."
},
{
"aid": 5,
"atext": "Cyclohexane"
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 94 | The lithium aluminum hydride is a nucleophile strong enough to be added to the carbonyl group of the carboxylate ions. This process allows obtaining: | 1 | [
{
"aid": 1,
"atext": "Primary alcohols."
},
{
"aid": 2,
"atext": "Secondary alcohols"
},
{
"aid": 3,
"atext": "Tertiary alcohols."
},
{
"aid": 4,
"atext": "Ketones"
},
{
"aid": 5,
"atext": "Ethers"
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 95 | The reaction between a ketone and a Grignard reagent causes, after hydrolysing the salt formed, a: | 2 | [
{
"aid": 1,
"atext": "Carboxylic ester."
},
{
"aid": 2,
"atext": "Alcohol."
},
{
"aid": 3,
"atext": "Ether."
},
{
"aid": 4,
"atext": "Aldehyde."
},
{
"aid": 5,
"atext": "Carboxylic acid."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 96 | In the aromatic electrophilic substitution with a monosubstituted benzene ring, the halogens are: | 5 | [
{
"aid": 1,
"atext": "Ortho / for leaders but activating."
},
{
"aid": 2,
"atext": "Target leaders but activating."
},
{
"aid": 3,
"atext": "Goal / for leaders but activating."
},
{
"aid": 4,
"atext": "Ortho / goal leaders but activating."
},
{
"aid": 5,
"atext": "Ortho / for leaders but deactivators."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 98 | The reaction of 1H-indole with electrophiles takes place selectively on the atom in position: | 3 | [
{
"aid": 1,
"atext": "one."
},
{
"aid": 2,
"atext": "two."
},
{
"aid": 3,
"atext": "3."
},
{
"aid": 4,
"atext": "Four."
},
{
"aid": 5,
"atext": "5."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 99 | The enolate ions undergo conjugate addition to α, β-unsaturated aldehydes and ketones, a reaction known as: | 1 | [
{
"aid": 1,
"atext": "Addition of Michael."
},
{
"aid": 2,
"atext": "Addition of Prins."
},
{
"aid": 3,
"atext": "Transposition of Cope."
},
{
"aid": 4,
"atext": "Radical addition."
},
{
"aid": 5,
"atext": "Transposition of Beckman."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 100 | The heating of trans, cis, trans-2,4,6octatriene results in: | 5 | [
{
"aid": 1,
"atext": "trans, trans, trans-2,4,6-Octatriene."
},
{
"aid": 2,
"atext": "cis, cis, cis-2,4,6-Octatriene."
},
{
"aid": 3,
"atext": "There is no reaction."
},
{
"aid": 4,
"atext": "trans-5,6-Dimethyl-1,3-cyclohexadiene."
},
{
"aid": 5,
"atext": "cis -5,6-Dimethyl-1,3-cyclohexadiene."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 101 | The reaction conditions for the preparation of 2-methyl-2-methoxypropan-1-ol from 2,2-dimethyloxirane are: | 1 | [
{
"aid": 1,
"atext": "Methanol in acid medium."
},
{
"aid": 2,
"atext": "Lithium aluminum hydride in methanol."
},
{
"aid": 3,
"atext": "Methylmagnesium bromide and subsequent hydrolysis."
},
{
"aid": 4,
"atext": "Sodium methoxide in methanol."
},
{
"aid": 5,
"atext": "Triphenylphosphine in methanol."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 102 | The stabilizing effect of the alkyl groups on the adjacent π bonds is explained in terms of: | 4 | [
{
"aid": 1,
"atext": "Isomería."
},
{
"aid": 2,
"atext": "Mesomería."
},
{
"aid": 3,
"atext": "Inductive effect"
},
{
"aid": 4,
"atext": "Hyperconjugation."
},
{
"aid": 5,
"atext": "Stereoisomería."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 103 | The reaction product of cyclohexanone with bromine catalyzed by a base is: | 5 | [
{
"aid": 1,
"atext": "2-Bromocyclohexanone."
},
{
"aid": 2,
"atext": "2,2-Dibromocyclohexanone."
},
{
"aid": 3,
"atext": "2,2,6-Tribomociclohexanona."
},
{
"aid": 4,
"atext": "1,1-Dibromocyclohexane."
},
{
"aid": 5,
"atext": "2,2,6,6-Tetrabromocyclohexanone."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 104 | Of the following reaction mechanisms, in which there is an inversion of the configuration from the reactant to the product of the reaction ?: | 1 | [
{
"aid": 1,
"atext": "Bimolecular nucleophilic substitution (SN2)."
},
{
"aid": 2,
"atext": "Unimolecular elimination (E1)."
},
{
"aid": 3,
"atext": "Unimolecular nucleophilic substitution (SN1)."
},
{
"aid": 4,
"atext": "Addition Markovnikov."
},
{
"aid": 5,
"atext": "Addition anti-Markovnikov."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 105 | The systematic nomenclature rules of the IUPAC give priority as a main function, from among the following functional groups, to: | 2 | [
{
"aid": 1,
"atext": "Amines"
},
{
"aid": 2,
"atext": "Carboxylic acids."
},
{
"aid": 3,
"atext": "Nitriles"
},
{
"aid": 4,
"atext": "Carboxylic ethers."
},
{
"aid": 5,
"atext": "Aldehydes."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 106 | The aldol condensation gives rise to: | 3 | [
{
"aid": 1,
"atext": "Α, β-unsaturated amides."
},
{
"aid": 2,
"atext": "Saturated amides."
},
{
"aid": 3,
"atext": "Α, β-unsaturated carbonyl compounds."
},
{
"aid": 4,
"atext": "Chiral compounds."
},
{
"aid": 5,
"atext": "Β, γ-unsaturated carbonyl compounds."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 107 | By reaction of carbonyls with primary and secondary amine, the following are obtained: | 2 | [
{
"aid": 1,
"atext": "Iminas and oximes."
},
{
"aid": 2,
"atext": "Iminas and enaminas."
},
{
"aid": 3,
"atext": "Oxazones and hydrazones."
},
{
"aid": 4,
"atext": "Semicarbazones and nitrones."
},
{
"aid": 5,
"atext": "None of the above."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 108 | The so-called "synthesis gas" that is used for the preparation of methanol on a large scale consists of a pressure mixture of: | 4 | [
{
"aid": 1,
"atext": "CO2 and hydrogen."
},
{
"aid": 2,
"atext": "CO, hydrogen and water."
},
{
"aid": 3,
"atext": "CO2, hydrogen and water."
},
{
"aid": 4,
"atext": "CO and hydrogen."
},
{
"aid": 5,
"atext": "None of the above."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 109 | A compound that has a five-membered aromatic heterocyclic skeleton with three carbon atoms and two nitrogens, the latter being positions 1 and 3, is called: | 5 | [
{
"aid": 1,
"atext": "Pirrol."
},
{
"aid": 2,
"atext": "Pyrimidine"
},
{
"aid": 3,
"atext": "Pyrazole"
},
{
"aid": 4,
"atext": "Pyrazolidine."
},
{
"aid": 5,
"atext": "Imidazole"
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 110 | In mass spectrometry, the most common fragmentation pattern is the break in α, which cleaves the alkyl bond adjacent to the carbonyl to give: | 1 | [
{
"aid": 1,
"atext": "The corresponding acyl cation and an alkyl radical."
},
{
"aid": 2,
"atext": "The corresponding acyl anion and an alkyl radical."
},
{
"aid": 3,
"atext": "The corresponding acyl radical and an alkyl radical."
},
{
"aid": 4,
"atext": "The corresponding acyl cation and an alkyl cation."
},
{
"aid": 5,
"atext": "The corresponding acyl anion and an alkyl anion."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 111 | Which of the following compounds has more basic character ?: | 3 | [
{
"aid": 1,
"atext": "Sodium hydroxide."
},
{
"aid": 2,
"atext": "Sodium ethoxide"
},
{
"aid": 3,
"atext": "Sodium amide"
},
{
"aid": 4,
"atext": "Sodium bicarbonate."
},
{
"aid": 5,
"atext": "Sodium carbonate."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 112 | The reordering of Cope is a reordering: | 4 | [
{
"aid": 1,
"atext": "From an allyl vinyl ether."
},
{
"aid": 2,
"atext": "[1,3] -sigmatropic."
},
{
"aid": 3,
"atext": "[1,2] -sigmatropic."
},
{
"aid": 4,
"atext": "[3,3] -sigmatropic."
},
{
"aid": 5,
"atext": "It is a cycloaddition [4 + 2]."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 113 | A very important industrial method for the formation of carbon-nitrogen bonds is the transposition of Beckman, a reaction that transforms: | 5 | [
{
"aid": 1,
"atext": "A ketone in a pyridine."
},
{
"aid": 2,
"atext": "An oxime in an amine."
},
{
"aid": 3,
"atext": "An aldehyde in an amide."
},
{
"aid": 4,
"atext": "A ketone in an amide."
},
{
"aid": 5,
"atext": "An oxime in an amide."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 114 | Sodium borohydride is a reagent used in Organic Chemistry for its properties such as: | 1 | [
{
"aid": 1,
"atext": "Reducer."
},
{
"aid": 2,
"atext": "Oxidizer"
},
{
"aid": 3,
"atext": "Alkylator"
},
{
"aid": 4,
"atext": "Acid."
},
{
"aid": 5,
"atext": "Organometallic."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 115 | The reaction of an alkene with metachloroperbenzoic acid causes a cyclic ether which is called: | 3 | [
{
"aid": 1,
"atext": "Furano"
},
{
"aid": 2,
"atext": "Dioxane"
},
{
"aid": 3,
"atext": "Epoxide"
},
{
"aid": 4,
"atext": "Azirano"
},
{
"aid": 5,
"atext": "Lactone"
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 116 | The type of membrane transport that uses ionic gradients as an energy source is: | 4 | [
{
"aid": 1,
"atext": "Facilitated dissemination."
},
{
"aid": 2,
"atext": "Passive transport"
},
{
"aid": 3,
"atext": "Primary active transport."
},
{
"aid": 4,
"atext": "Secondary active transport."
},
{
"aid": 5,
"atext": "Simple diffusion."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 117 | Which of the following covalent bonds does not appear in proteins ?: | 1 | [
{
"aid": 1,
"atext": "Phosphodiester linkage."
},
{
"aid": 2,
"atext": "Amide link."
},
{
"aid": 3,
"atext": "O-glucosidic bond."
},
{
"aid": 4,
"atext": "Disulfide bond."
},
{
"aid": 5,
"atext": "Hydrogen bond."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 118 | A promoter place in the DNA: | 2 | [
{
"aid": 1,
"atext": "Transcribe the repressor."
},
{
"aid": 2,
"atext": "Start the transcription."
},
{
"aid": 3,
"atext": "It encodes the RNA polymerase."
},
{
"aid": 4,
"atext": "Regulate the termination."
},
{
"aid": 5,
"atext": "Translate specific proteins."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 119 | Which of the following compounds can not serve as a precursor for the synthesis of glucose via gluconeogenesis ?: | 1 | [
{
"aid": 1,
"atext": "Acetate."
},
{
"aid": 2,
"atext": "Glycerol"
},
{
"aid": 3,
"atext": "Lactate"
},
{
"aid": 4,
"atext": "Oxalacetate."
},
{
"aid": 5,
"atext": "α-ketoglutarate."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 120 | The first step in the folding of disordered polypetide chains is: | 5 | [
{
"aid": 1,
"atext": "Formation of the primary structure."
},
{
"aid": 2,
"atext": "Formation of disulfide bridges."
},
{
"aid": 3,
"atext": "Formation of aggregates."
},
{
"aid": 4,
"atext": "Post-translational modifications."
},
{
"aid": 5,
"atext": "Formation of secondary structure elements."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 121 | What RNA eukaryotic polymerase is involved in the transcription of messenger RNA (mRNA) ?: | 2 | [
{
"aid": 1,
"atext": "RNA Polymerase I."
},
{
"aid": 2,
"atext": "RNA Polymerase II."
},
{
"aid": 3,
"atext": "RNA Polymerase III."
},
{
"aid": 4,
"atext": "RNA Polymerase IV."
},
{
"aid": 5,
"atext": "Transcription of mRNA is carried out jointly by RNA Polymerase I and RNA Polymerase II."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 122 | Which of the following enzymes catalyzes phosphorylation using inorganic phosphate: | 3 | [
{
"aid": 1,
"atext": "Hexokinase."
},
{
"aid": 2,
"atext": "Fosfofructoquinasa."
},
{
"aid": 3,
"atext": "Glyceraldehyde-3-phosphate dehydrogenase."
},
{
"aid": 4,
"atext": "Phosphoglycerate kinase."
},
{
"aid": 5,
"atext": "Pyruvate kinase."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 123 | Which of the following statements is NOT true about glucagon ?: | 1 | [
{
"aid": 1,
"atext": "Activates hepatic glycogenesis."
},
{
"aid": 2,
"atext": "Activates lipolysis in white adipose tissue."
},
{
"aid": 3,
"atext": "Activates hepatic glycogenolysis."
},
{
"aid": 4,
"atext": "It is a polypeptide."
},
{
"aid": 5,
"atext": "It is synthesized in the α cells of the islets of Langerhans of the pancreas."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 124 | How are the proteins involved in the DNA curl and compaction called ?: | 3 | [
{
"aid": 1,
"atext": "Kinases"
},
{
"aid": 2,
"atext": "Topoisomerases"
},
{
"aid": 3,
"atext": "Histones."
},
{
"aid": 4,
"atext": "Phosphatases"
},
{
"aid": 5,
"atext": "DNA nucleases"
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 125 | Insulin regulates the synthesis of fatty acids: | 2 | [
{
"aid": 1,
"atext": "Activating phosphorylase"
},
{
"aid": 2,
"atext": "Dephosphorylating acetyl CoA carboxylase."
},
{
"aid": 3,
"atext": "Inhibiting the formation of malonyl CoA."
},
{
"aid": 4,
"atext": "Controlling the carnitine-acyl CoA transferase activity."
},
{
"aid": 5,
"atext": "Activating the fatty acid synthetase."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 126 | Oxidative phosphorylation involves: | 4 | [
{
"aid": 1,
"atext": "The oxidation of H2O to form O2."
},
{
"aid": 2,
"atext": "Oxidation of O2 to form H2O."
},
{
"aid": 3,
"atext": "The reduction of H2O to give O2."
},
{
"aid": 4,
"atext": "The reduction of O2 to give H2O."
},
{
"aid": 5,
"atext": "None of the above."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 127 | Glycogenin: | 4 | [
{
"aid": 1,
"atext": "It catalyzes the conversion of starch into glycogen."
},
{
"aid": 2,
"atext": "It is the enzyme responsible for the formation of branches in glycogen."
},
{
"aid": 3,
"atext": "It is the gene that codes for glycogen synthase."
},
{
"aid": 4,
"atext": "It is the primer on which new chains of glycogen start."
},
{
"aid": 5,
"atext": "Regulates glycogen synthesis."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 128 | The altered or minority nitrogenous bases: | 3 | [
{
"aid": 1,
"atext": "They are not detected in DNA."
},
{
"aid": 2,
"atext": "They are not detected in the RNA."
},
{
"aid": 3,
"atext": "They protect genetic information."
},
{
"aid": 4,
"atext": "They are not detected in the tRNA."
},
{
"aid": 5,
"atext": "They are not able to mate."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 129 | The precursor of all the pyrimidine nucleotides of the cell is: | 1 | [
{
"aid": 1,
"atext": "Uridine monophosphate (UMP)."
},
{
"aid": 2,
"atext": "Thymidine monophosphate (TMP)."
},
{
"aid": 3,
"atext": "Cytidine monophosphate (cmp)."
},
{
"aid": 4,
"atext": "Inosine monophosphate (IMP)."
},
{
"aid": 5,
"atext": "Guanidine monophosphate (GMP)."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 130 | All the following statements describe characteristics of the peptide link EXCEPT: | 3 | [
{
"aid": 1,
"atext": "It has a trans configuration."
},
{
"aid": 2,
"atext": "It is polar but without charge."
},
{
"aid": 3,
"atext": "It forms a single bond by directly joining the α carbons of adjacent amino acids."
},
{
"aid": 4,
"atext": "It does not present rotation around the link."
},
{
"aid": 5,
"atext": "Is flat."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 131 | CO is toxic to aerobic organisms: | 3 | [
{
"aid": 1,
"atext": "Because it oxidizes the OH groups of the hemoglobin, preventing it from being able to fix O2 correctly."
},
{
"aid": 2,
"atext": "Because it enters the mitochondria, picking up electrons from the transport chain with less efficiency than O2."
},
{
"aid": 3,
"atext": "Because it joins the heme group with greater affinity than O2."
},
{
"aid": 4,
"atext": "Because having a greater dipolar character, is more soluble than O2 in blood and blocks the exchange of O2 between air and blood at the level of the lungs."
},
{
"aid": 5,
"atext": "None of the above is correct."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 132 | Pyridoxal phosphate is a prosthetic group of enzymes involved in reactions of: | 5 | [
{
"aid": 1,
"atext": "Acetylation"
},
{
"aid": 2,
"atext": "Desulfation."
},
{
"aid": 3,
"atext": "Methylation"
},
{
"aid": 4,
"atext": "Reduction."
},
{
"aid": 5,
"atext": "Transamination."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 133 | Which of the following compounds in a fundamental intermediate of the synthesis of triacylglycerols and phospholipids: | 2 | [
{
"aid": 1,
"atext": "CDP-choline."
},
{
"aid": 2,
"atext": "Phosphatidate"
},
{
"aid": 3,
"atext": "Triglyceride"
},
{
"aid": 4,
"atext": "Phosphatidylserine"
},
{
"aid": 5,
"atext": "CDP-diacylglycerol."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 134 | At neutral pH, a mixture of amino acids in solution would be predominantly: | 1 | [
{
"aid": 1,
"atext": "Dipolar Ions"
},
{
"aid": 2,
"atext": "Non-polar molecules."
},
{
"aid": 3,
"atext": "Positive and monovalent."
},
{
"aid": 4,
"atext": "Hydrophobic"
},
{
"aid": 5,
"atext": "Negative and monovalent."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 135 | Phosphatidylinositols: | 2 | [
{
"aid": 1,
"atext": "They are derivatives of glucocerebrosides."
},
{
"aid": 2,
"atext": "They act as intracellular signals."
},
{
"aid": 3,
"atext": "They are lysosomal lipids."
},
{
"aid": 4,
"atext": "They are biological detergents."
},
{
"aid": 5,
"atext": "They contain taurine or glycine."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 136 | During oxidative phosphorylation, the proton-motor force generated by electronic transport is used to: | 3 | [
{
"aid": 1,
"atext": "Create a pore in the inner mitochondrial membrane."
},
{
"aid": 2,
"atext": "Generate substrates (ADP and Pi) for ATP synthase."
},
{
"aid": 3,
"atext": "Induce a conformational change in the ATP synthase."
},
{
"aid": 4,
"atext": "Oxidize NADH to NAD +."
},
{
"aid": 5,
"atext": "Reduce O2 to H2O."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 138 | Indicate which of the following statements is true about bilirubin: | 1 | [
{
"aid": 1,
"atext": "It is a catabolic product of the heme group."
},
{
"aid": 2,
"atext": "It is a product of the urea cycle."
},
{
"aid": 3,
"atext": "It is an intermediary of the Krebs cycle."
},
{
"aid": 4,
"atext": "It is a precursor of hepatic gluconeogenesis."
},
{
"aid": 5,
"atext": "It is a product of cholesterol degradation."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 139 | Which of the following statements about sphingolipids is CERTAIN: | 4 | [
{
"aid": 1,
"atext": "They may have charge, but they are not amphipathic molecules."
},
{
"aid": 2,
"atext": "They are formed by glycerol and fatty acids."
},
{
"aid": 3,
"atext": "They contain two esterified fatty acids."
},
{
"aid": 4,
"atext": "The cerebrosides and ganglosides are sphingolipids."
},
{
"aid": 5,
"atext": "Terpenes are the main sphingolipids."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 140 | In the β-oxidation of odd-chain fatty acids, what is the molecule that forms with the last three carbons to enter the citric acid cycle ?: | 3 | [
{
"aid": 1,
"atext": "Propionyl-CoA."
},
{
"aid": 2,
"atext": "Methylmalonyl-CoA."
},
{
"aid": 3,
"atext": "Succinyl-CoA."
},
{
"aid": 4,
"atext": "Succinate"
},
{
"aid": 5,
"atext": "Malate."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 141 | Which of the following intermediaries can be isolated in yeasts that ferment wine and not in healthy muscle: | 2 | [
{
"aid": 1,
"atext": "Lactate"
},
{
"aid": 2,
"atext": "Acetaldehyde"
},
{
"aid": 3,
"atext": "Acetyl CoA"
},
{
"aid": 4,
"atext": "Citrate."
},
{
"aid": 5,
"atext": "Oxalacetate."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 142 | Indicate which of the following compounds has antioxidant action: | 3 | [
{
"aid": 1,
"atext": "Vitamin B."
},
{
"aid": 2,
"atext": "Vitamin D."
},
{
"aid": 3,
"atext": "Vitamin E."
},
{
"aid": 4,
"atext": "All the previous ones"
},
{
"aid": 5,
"atext": "None of the above."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 143 | In the sequencing of DNA by the Sanger method: | 1 | [
{
"aid": 1,
"atext": "The 2`-3` dideoxynucleotides are essential."
},
{
"aid": 2,
"atext": "It is necessary to use suicide inhibitors of DNA polymerase."
},
{
"aid": 3,
"atext": "DNA must maintain its double helix structure."
},
{
"aid": 4,
"atext": "The DNA is hydrolyzed selectively."
},
{
"aid": 5,
"atext": "The restriction endonucleases are fundamental."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 144 | In contrast to the bacterial ones, the eukaryotic chromosomes need multiple origins of replication because: | 4 | [
{
"aid": 1,
"atext": "They can not be replicated bidirectionally."
},
{
"aid": 2,
"atext": "They are not usually circular."
},
{
"aid": 3,
"atext": "The processivity of eukaryotic DNA polymerase is much lower than that of bacterial DNA polymerase."
},
{
"aid": 4,
"atext": "Its replication rate is much slower, and they would need too much time using a single source."
},
{
"aid": 5,
"atext": "They have several DNA polymerases for different purposes, and they need the corresponding variety of origins."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 145 | The hormonal stimulation of the formation of the second messenger inositol 1,4,5-trisfosfato (IP3) quickly leads to the release of what other intracellular messenger: | 3 | [
{
"aid": 1,
"atext": "Cyclic AMP."
},
{
"aid": 2,
"atext": "Prostaglandin"
},
{
"aid": 3,
"atext": "Calcium."
},
{
"aid": 4,
"atext": "Leukotriene"
},
{
"aid": 5,
"atext": "Thromboxane"
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 146 | Allopurinol, as an inhibitor of xanthine oxidase: | 2 | [
{
"aid": 1,
"atext": "It is suicidal, reversible."
},
{
"aid": 2,
"atext": "It is suicidal, irreversible."
},
{
"aid": 3,
"atext": "It is analogous to the transition state, reversible."
},
{
"aid": 4,
"atext": "Inhibits the enzyme by proteolysis."
},
{
"aid": 5,
"atext": "Allopurinol does not inhibit that enzyme."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 147 | On the molecular biology of cancer: | 1 | [
{
"aid": 1,
"atext": "Oncogenes are mutated derivatives of normal genes, called protooncogenes, whose function is to promote cell proliferation or survival."
},
{
"aid": 2,
"atext": "Oncogenes are genes that synthesize proteins that inhibit cell proliferation."
},
{
"aid": 3,
"atext": "The tumor suppressor genes synthesize proteins that inhibit cell death."
},
{
"aid": 4,
"atext": "Protooncogenes synthesize proteins that promote cell death."
},
{
"aid": 5,
"atext": "Apoptosis is a form of activation of proto-oncogenes."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 148 | Of the following statements of the electron transport chain. Which is true ?: | 4 | [
{
"aid": 1,
"atext": "An FADH molecule can generate up to 2.5 molecules of ATP."
},
{
"aid": 2,
"atext": "One molecule of NADH can generate up to 1.5 molecules of ATP."
},
{
"aid": 3,
"atext": "Electrons flow from more positive reduction potentials to more negative reduction potentials."
},
{
"aid": 4,
"atext": "Complex II (used by FADH2) does not transfer protons to the intermembrane space."
},
{
"aid": 5,
"atext": "Complex III uses copper (Cu) atoms as cofactors."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 149 | For which of the following steps of protein synthesis GTP (Guanosine triosphate) is needed: | 3 | [
{
"aid": 1,
"atext": "Activation of amino acids by aminioacyl-tRNA synthetases."
},
{
"aid": 2,
"atext": "Union of ribosomes to the endoplasmic reticulum."
},
{
"aid": 3,
"atext": "Translocation of nascent tRNA-protein complex from place A to place P."
},
{
"aid": 4,
"atext": "Union of mRNA."
},
{
"aid": 5,
"atext": "Union of signal recognition protein to ribosomes."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 150 | The primosome: | 5 | [
{
"aid": 1,
"atext": "It is also called primasa or Dna G protein."
},
{
"aid": 2,
"atext": "It is the complex responsible for the synthesis of the Okazaki fragments."
},
{
"aid": 3,
"atext": "It is a bacterial DNA ligase."
},
{
"aid": 4,
"atext": "It is located in the mitochondria."
},
{
"aid": 5,
"atext": "It is a functional unit of the bacterial replication complex."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 151 | Glycolysis and hepatic gluconeogenesis are regulated reciprocally by facilitated hormonal mechanisms, in addition to an important metabolite that determines whether glucose should be synthesized or degraded. Which?: | 3 | [
{
"aid": 1,
"atext": "Fructose 6-phosphate."
},
{
"aid": 2,
"atext": "Fructose 1,6-bisphosphate."
},
{
"aid": 3,
"atext": "Fructose 2,6-bisphosphate."
},
{
"aid": 4,
"atext": "Pyruvate."
},
{
"aid": 5,
"atext": "Lactate"
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 152 | Which of the following enzymes acts in the pentose phosphate route ?: | 2 | [
{
"aid": 1,
"atext": "Aldolase"
},
{
"aid": 2,
"atext": "Glucose 6-phosphate dehydrogenase."
},
{
"aid": 3,
"atext": "Glycogen phosphorylase."
},
{
"aid": 4,
"atext": "Fosfofructoquinasa-1."
},
{
"aid": 5,
"atext": "Pyruvate kinase."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 153 | Which of the following strands of DNA has the same nucleotide sequence (except the change of T for U) as its primary transcript: | 1 | [
{
"aid": 1,
"atext": "The coding strand."
},
{
"aid": 2,
"atext": "The mold thread."
},
{
"aid": 3,
"atext": "The leading thread."
},
{
"aid": 4,
"atext": "The delayed strand"
},
{
"aid": 5,
"atext": "Any."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 154 | Which of the following steps of cholesterol biosynthesis is what controls the speed and place of metabolic regulation: | 5 | [
{
"aid": 1,
"atext": "Geranyl pyrophosphate Farnesyl pyrophosphate."
},
{
"aid": 2,
"atext": "Squalene Lanosterol"
},
{
"aid": 3,
"atext": "Lanosterol Cholesterol."
},
{
"aid": 4,
"atext": "Acetyl CoA Acetoacetyl CoA."
},
{
"aid": 5,
"atext": "3-Hydroxy-3-methylglutaryl CoA Mevalonic acid."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 156 | What is the part of the antigen that is recognized by the antibody called ?: | 4 | [
{
"aid": 1,
"atext": "Ectopic."
},
{
"aid": 2,
"atext": "Epimer."
},
{
"aid": 3,
"atext": "Epithet."
},
{
"aid": 4,
"atext": "Epitope."
},
{
"aid": 5,
"atext": "Endogenous."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 157 | The increase in standard free energy of ATP hydrolysis depends, among others, on the following structural characteristic: | 3 | [
{
"aid": 1,
"atext": "Its polar character."
},
{
"aid": 2,
"atext": "Its amphipathic nature"
},
{
"aid": 3,
"atext": "Its stabilization by resonance."
},
{
"aid": 4,
"atext": "Of the phosphoryl group number it contains."
},
{
"aid": 5,
"atext": "Of the cation with which the soluble salt forms."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 158 | The hepatic synthesis of methionine from homocysteine requires: | 4 | [
{
"aid": 1,
"atext": "N5, N10 methenyl-tetrahydrofolate."
},
{
"aid": 2,
"atext": "N10-formyl-tetrahydrofolate."
},
{
"aid": 3,
"atext": "N5-formimino-tetrahydrofolate."
},
{
"aid": 4,
"atext": "N5-methyl-tetrahydrofolate."
},
{
"aid": 5,
"atext": "N5, N10 methylene-tetrahydrofolate."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 159 | In relation to the structure of the genomes, the introns: | 2 | [
{
"aid": 1,
"atext": "They frequently occur in prokaryotic genomes."
},
{
"aid": 2,
"atext": "There may be several in the same gene."
},
{
"aid": 3,
"atext": "They encode rare amino acids in proteins."
},
{
"aid": 4,
"atext": "They are transcribed and translated."
},
{
"aid": 5,
"atext": "They have a high content in G: C pairs."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 160 | Mitochondrial electronic transport and oxidative phosphorylation: | 1 | [
{
"aid": 1,
"atext": "They are two different processes, but coupled. Without electronic transport there will never be oxidative phosphorylation."
},
{
"aid": 2,
"atext": "Without oxidative phosphorylation there can never be electronic transport."
},
{
"aid": 3,
"atext": "The net yield of oxidative phosphorylation is about 2.5 moles of ATP per mole of FADH2."
},
{
"aid": 4,
"atext": "Cyanide is toxic because it binds to ATP synthase."
},
{
"aid": 5,
"atext": "Uncoupling agents inhibit ATP synthase."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 161 | The glycolic fraction of the glycolipids of the membrane of eukaryotic cells: | 3 | [
{
"aid": 1,
"atext": "It is located on the cytoplasmic side of the membrane."
},
{
"aid": 2,
"atext": "It always has sialic acid."
},
{
"aid": 3,
"atext": "They are synthesized by the action of several glycosyl transferases."
},
{
"aid": 4,
"atext": "It is a glucose oligomer."
},
{
"aid": 5,
"atext": "It has no antigenic power."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 162 | Which of the following enzymes catalyzes a hydrolytic reaction ?: | 2 | [
{
"aid": 1,
"atext": "Lactate dehydrogenase."
},
{
"aid": 2,
"atext": "Chymotrypsin"
},
{
"aid": 3,
"atext": "Fumarasa"
},
{
"aid": 4,
"atext": "Triose phosphate isomerase."
},
{
"aid": 5,
"atext": "RNA polymerase"
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 163 | Type II restriction endonucleases cleave the DNA molecule: | 1 | [
{
"aid": 1,
"atext": "Within its recognition sequence."
},
{
"aid": 2,
"atext": "Randomly"
},
{
"aid": 3,
"atext": "Out of the recognition sequence."
},
{
"aid": 4,
"atext": "At the 5 'end."
},
{
"aid": 5,
"atext": "At the 3 'end."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 164 | The recombinant DNA is: | 3 | [
{
"aid": 1,
"atext": "A DNA molecule that activates heterologous recombination."
},
{
"aid": 2,
"atext": "A precursor messenger RNA molecule."
},
{
"aid": 3,
"atext": "A DNA molecule composed of segments covalently linked from two or more sources."
},
{
"aid": 4,
"atext": "A diploid DNA molecule."
},
{
"aid": 5,
"atext": "A multienzyme complex of DNA polymerases covalently linked."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 165 | The proofreading activity of the DNA Polymerase is an activity: | 2 | [
{
"aid": 1,
"atext": "5'-3'Exonuclease."
},
{
"aid": 2,
"atext": "3'-5'Exonuclease."
},
{
"aid": 3,
"atext": "Polymerizing 5'-3 '."
},
{
"aid": 4,
"atext": "Endonuclease."
},
{
"aid": 5,
"atext": "Transesterifier."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 166 | The differential modification of RNA: | 1 | [
{
"aid": 1,
"atext": "It can result in multiple products from one gene."
},
{
"aid": 2,
"atext": "It occurs thanks to the transcription bubble."
},
{
"aid": 3,
"atext": "It is catalyzed by RNA polymerase I."
},
{
"aid": 4,
"atext": "It is catalyzed by RNA polymerase II."
},
{
"aid": 5,
"atext": "It is catalyzed by RNA polymerase III."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 167 | The new proteins destined for secretion are synthesized in: | 5 | [
{
"aid": 1,
"atext": "Golgi apparatus."
},
{
"aid": 2,
"atext": "Smooth endoplasmic reticulum."
},
{
"aid": 3,
"atext": "Free polysomes."
},
{
"aid": 4,
"atext": "Nucleus."
},
{
"aid": 5,
"atext": "Rough endoplasmic reticulum."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 168 | Which of the following membranes would be more fluid: | 4 | [
{
"aid": 1,
"atext": "Lipid bilayer with polyunsaturated fatty acids of 18 carbon atoms."
},
{
"aid": 2,
"atext": "Lipid bilayer with saturated fatty acids of 18 carbon atoms."
},
{
"aid": 3,
"atext": "Lipid bilayer with saturated fatty acids of 16 carbon atoms."
},
{
"aid": 4,
"atext": "Lipid bilayer with polyunsaturated fatty acids of 16 carbon atoms."
},
{
"aid": 5,
"atext": "All are equivalent in terms of fluency."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 169 | The denaturing of DNA: | 2 | [
{
"aid": 1,
"atext": "It increases when the temperature decreases."
},
{
"aid": 2,
"atext": "It is accompanied by an increase in the absorption of UV light."
},
{
"aid": 3,
"atext": "DNA with high G / C content does so at a lower temperature than those rich in A / T."
},
{
"aid": 4,
"atext": "It is irreversible."
},
{
"aid": 5,
"atext": "Indicates the hydrolysis of phosphodiester bonds."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 170 | What coenzyme is used in amino acid transamination reactions: | 3 | [
{
"aid": 1,
"atext": "FAD."
},
{
"aid": 2,
"atext": "Biotin"
},
{
"aid": 3,
"atext": "Pyridoxal."
},
{
"aid": 4,
"atext": "NAD +."
},
{
"aid": 5,
"atext": "NADP +."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 171 | In the study of proteins. What is the purpose of treatment with β-mercaptoethanol ?: | 2 | [
{
"aid": 1,
"atext": "Hydrolyze the protein."
},
{
"aid": 2,
"atext": "Break the disulfide bridges."
},
{
"aid": 3,
"atext": "Add positive charges."
},
{
"aid": 4,
"atext": "Add negative charges."
},
{
"aid": 5,
"atext": "General an amino acid derivative in Edman degradation."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 172 | Catalase: | 1 | [
{
"aid": 1,
"atext": "Acts on hydrogen peroxide."
},
{
"aid": 2,
"atext": "It results in the formation of hydrogen peroxide."
},
{
"aid": 3,
"atext": "It acts on the superoxide anion."
},
{
"aid": 4,
"atext": "It converts hydrogen peroxide into superoxide anion."
},
{
"aid": 5,
"atext": "Use glutathione as a cofactor."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 173 | What happens to the kinetic parameters of a michael enzyme in the presence of a competitive inhibitor ?: | 4 | [
{
"aid": 1,
"atext": "Vmax decreases, Km increases."
},
{
"aid": 2,
"atext": "Vmax decreases, Km decreases."
},
{
"aid": 3,
"atext": "Vmax decreases, Km does not change."
},
{
"aid": 4,
"atext": "Vmax does not vary, Km increases."
},
{
"aid": 5,
"atext": "Vmax does not vary, Km decreases."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 174 | Which of the following products of triglyceride degradation and subsequent β-oxidation can undergo gluconeogenesis: | 1 | [
{
"aid": 1,
"atext": "Propionyl CoA."
},
{
"aid": 2,
"atext": "Acetyl CoA"
},
{
"aid": 3,
"atext": "All the ketone bodies."
},
{
"aid": 4,
"atext": "Some amino acids"
},
{
"aid": 5,
"atext": "β-Hydroxybutyrate."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 175 | The active center of an enzyme: | 5 | [
{
"aid": 1,
"atext": "It is formed by functional groups that come from the central amino acid sequence of the enzyme."
},
{
"aid": 2,
"atext": "It constitutes a large part of the total volume of the enzyme."
},
{
"aid": 3,
"atext": "Increases the ΔG of a reaction, increasing the speed of it."
},
{
"aid": 4,
"atext": "It has a high amount of water molecules together with amino acids."
},
{
"aid": 5,
"atext": "It is the region that joins the substrates and contains the waste that participates in the formation and breaking of links."
}
] |
Cuaderno_2014_1_Q | 2014 | chemistry | 176 | An allosteric modulator influences the activity of an enzyme: | 2 | [
{
"aid": 1,
"atext": "Competing with a substrate for the catalytic site."
},
{
"aid": 2,
"atext": "Joining the enzyme at a site other than the catalytic site."
},
{
"aid": 3,
"atext": "Changing the nature of the formed product."
},
{
"aid": 4,
"atext": "Changing the specificity of the enzyme for the substrate."
},
{
"aid": 5,
"atext": "Denaturing the enzyme."
}
] |
Subsets and Splits