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GATE 2020 BT – Question 22

General Biology · Biochemistry: Enzymes, classification, catalytic and regulatory strategies, Michaelis-Menten kinetics and inhibition · 1 mark · Multiple choice

Which types of molecules act as biological catalysts?

[P] Protein; [Q] RNA; [R] Phospholipid.

  1. P and Q only
  2. P and R only
  3. Q and R only
  4. P, Q and R

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Correct answer: (A) P and Q only

Explanation

Most enzymes are proteins, so P is correct. Catalytic RNAs, or ribozymes, establish Q as correct as well; examples include RNA-processing catalysts and the ribosome’s peptidyl-transferase centre. Phospholipids are principally membrane components and are not the biological catalyst class intended here. Thus P and Q only, A.

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