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GATE 2025 BT – Question 41

General Biology · Biochemistry: Enzymes, classification, catalytic and regulatory strategies, Michaelis-Menten kinetics and inhibition · 2 marks · Multiple choice

Correctly match the Coenzyme with its respective involvement in a specific Reaction type.

CoenzymeReaction type
P. Thiamine pyrophosphate1. Acyl group transfer
Q. Tetrahydrofolate2. Transfer of one carbon group
R. Flavin adenine dinucleotide3. Transfer of methyl group
S. 5'-Deoxyadenosyl cobalamin4. Oxidation-reduction
5. Aldehyde transfer
  1. P-5; Q-2; R-4; S-3
  2. P-5; Q-1; R-2; S-3
  3. P-1; Q-2; R-4; S-5
  4. P-5; Q-3; R-1; S-2

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Correct answer: (A) P-5; Q-2; R-4; S-3

Explanation

Thiamine pyrophosphate transfers aldehyde (active aldehyde) groups (5), tetrahydrofolate carries one-carbon groups (2), FAD takes part in oxidation-reduction (4), and the cobalamin coenzymes are linked with the shift or transfer of a methyl group (3), the closest of the listed reaction types.

Official GATE 2025 answer key: https://gate2026.iitg.ac.in/doc/download/2025_Key/BT_Keys.pdf