Multiple Choice Questions (MCQs) for NEET Biology: Biomolecules
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Practice Biomolecules MCQs for NEET Biology
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Multiple Choice Questions
(a) Adenine, Thymine – Purines
(b) Thymine, Uracil – Pyrimidines
(c) Uracil, Cytosine – Pyrimidines
(d) Guanine, Adenine – Purines
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Answer: (a) Adenine, Thymine – Purines
Explanation:
1. Adenine and Guanine → Purines Thymine, uracil, cytosine → Pyrimidines.
(a) There are two strands which run antiparallel-one in 5′ → 3′ direction and other in 3′ → 5′
(b) The total amount of purine nucleotides and pyrimidine nucleotides is not always equal
(c) There are two strands which run parallel in the 5′ → 3′ direction
(d) The proportion of adenine in relation to thymine varies with the organism
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Answer: (a) There are two strands which run antiparallel-one in 5′ → 3′ direction and other in 3′ → 5′
Explanation:
1. In DNA, two antiparallel strands are coiled around a common axis.
(a) Thymine
(b) Uracil
(c) Cytosine
(d) Guanine
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Answer: (d) Guanine
Explanation:
1. This is so because thymine → Present in DNA, not in RNA Cytosine, uracil → Pyrimidine.
(a) Ligase
(b) Primase
(c) DNA polymerase
(d) Endonuclease
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Answer: (a) Ligase
Explanation:
1. Class VI → Ligase enzyme is used to join the bits of DNA. Primase → Is an enzyme use to attach primer.
2. DNA polymerase → is an enzyme use to add nucleotide in template strand of DNA. Endonuclease → It is an restriction enzyme which causes internal cleavage of DNA.
(a) Nucleotide
(b) Nucleoside
(c) Nucleic acid
(d) Vitamin
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Answer: (a) Nucleotide
Explanation:
1. This is so because ATP (Adenosine triphosphate) is made up of adenine, ribose sugar and 3 phosphate groups.
(a) Decrease activation energy
(b) Increase activation energy
(c) Inorganic catalyst
(d) None of these
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Answer: (a) Decrease activation energy
Explanation:
1. Potential Transition state energy Activation energy without enzyme Activation energy with enzyme Substrate energy Product Progress of reaction.
(a) C only
(b) C & D
(c) D only
(d) F only
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Answer: (d) F only
Explanation:
1. This is so because enzyme activity is affected by temperature, pH, enzyme concentration, product concentration and substrate concentration.
2. Enzyme are not affected by activation energy but it lowers down the activation energy.
(a) Malate
(b) Malonate
(c) Oxaloacetate
(d) Both (2) & (3)
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Answer: (d) Both (2) & (3)
Explanation:
1. Competitive inhibitors of succinic dehydrogenase are malate, malonate, oxaloacetate.
(a) Cyanide and cytochrome reaction
(b) Sulpha drugs and folic acid synthesizer bacteria
(c) Allosteric inhibition of hexokinase by glucose 6-phosphate
(d) Reaction between succinic dehydrogenase and succinic acid
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Answer: (c) Allosteric inhibition of hexokinase by glucose 6-phosphate
Explanation:
1. (1) Cyanide and cytochrome reaction → Example of non-competitive inhibition. (2) Sulpha drugs and folic acid synthesizer bacteria are example of non-competitive inhibition. (4) Reaction between succinic dehydrogenase and succinic acid are example of competitive inhibition.
(a) Substrate
(b) Enzyme
(c) End product
(d) Temperature
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Answer: (c) End product
Explanation:
1. Feedback inhibition is also konwn as End product inhibition or allosteric modulation.
(a) Decrease in Vmax and Km
(b) Unchanged Vmax and decrease in Km
(c) Unchanged Vmax and increase in Km
(d) Increase in Vmax and Km
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Answer: (c) Unchanged Vmax and increase in Km
Explanation:
1. Vmax = constant; Km = increased Vmax No Inhibitor With inhibitor Reaction velocity Vmax 2 Km K'm [S].
(a) Numerically equal to ½ Vmax
(b) Dependent on the enzyme concentration
(c) Numerically equal to the substrate concentration that gives half maximal velocity
(d) Increased in the presence of non-competitive inhibitor
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Answer: (c) Numerically equal to the substrate concentration that gives half maximal velocity
Explanation:
1. vmax Velocity vmax of reaction 2 Km [s].
(a) Loosely attached organic part
(b) Loosely attached inorganic part
(c) Non-protein organic part firmly attached with apoenzyme
(d) None of these
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Answer: (c) Non-protein organic part firmly attached with apoenzyme
Explanation:
1. Enzyme (Holoenzyme) Protein Non-protein (Apoenzyme) (Cofactor) Organic compound Inorganic compound It includes metal ions 2+ 2+ 2+ Tightly bound Loosely bound i.e., Zn , Mg , Ca etc. (Prosthetic group).
(a) Cellulose : Unbranched polymer with β,1-4 glycosidic linkage
(b) Cellophane : Cellulose xanthate
(c) Carboxypeptidase : Exopeptidase, Mg2+ acts as a co-factor
(d) Aminopeptidase : Exopeptidase, cleaves the peptide bond at N-terminal end
Show Answer & Explanation
Answer: (c) Carboxypeptidase : Exopeptidase, Mg2+ acts as a co-factor
Explanation:
1. Carboxypeptidase requires Zn2+ as cofactor.
(a) Always a protein
(b) Often a metal
(c) Always an inorganic compound
(d) Often a vitamin
Show Answer & Explanation
Answer: (a) Always a protein
Explanation:
1. Protein part of enzyme is known as apoenzyme and non-protein part of enzyme is known as cofactor.
Reason (R): NAD derived from niacin is a co-enzyme.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
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Answer: (b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
Explanation:
1. Organic compound firmly attach to protein part of enzyme is prosthetic group.
Reason (R): It is native configuration of protein molecules maintained by multiple covalent bonds only.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
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Answer: (c) Assertion is true but the Reason is false.
Explanation:
1. This is so because enzyme exists in tertiary structure in which sides group comes close and form an active site.
Reason (R): In non-competitive inhibition, inhibitor and substrate bind at same sites on the enzyme.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation
Answer: (d) Both Assertion and Reason are false.
Explanation:
1. Non-competitive inhibitors decrease Vmax.
Reason (R): In collagen helix locking effect also occurs with the help of proline and hydroxyproline amino acid.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation
Answer: (b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
Explanation:
1. In collagen, there are generally three polypeptides coil around one another.
Reason (R): All enzymes work at same pH.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
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Answer: (c) Assertion is true but the Reason is false.
Explanation:
1. Allosteric enzymes don't obey Michaelis Menten constant.
Reason (R): In competitive inhibition Vmax decreases.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
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Answer: (c) Assertion is true but the Reason is false.
Explanation:
1. Isoenzymes are the isomeric form of same enzyme.
Reason (R): In protein, only right handed helices are observed.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation
Answer: (b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
Explanation:
1. Enzymes have tertiary structure of protein.
Multiple Choice Questions (MCQs) for NEET Biology Biomolecules
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FAQs
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