Question

Choose the correct statements:

I. In exothermic reactions, ‘P’ is at a lower level than ‘S’
II. Enzyme activity is affected by temperature due to changes in tertiary structure
III. Low temperature denatures the protein
IV. Ligases remove groups from substrate

• A. I, II
• B. III, IV
• C. II, IV
• D. I, III

Hint:

Denaturation occurs at high temperature. Ligases = linking enzymes, not removal.

Answer 1

The Correct Option is A

- I: True — Exothermic reactions release energy; hence, product ‘P’ has lower energy than substrate ‘S’.
- II: True — Temperature changes protein’s 3D structure, impacting enzyme activity.
- III: False — Low temperature usually inactivates enzymes, not denature them.
- IV: False — Ligases catalyze joining of molecules, not removal.