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GATE 2022 CY – Question 30

Inorganic Chemistry · Bioinorganic Chemistry: Ion (Na+ and K+) transport, oxygen binding, transport and utilization, electron transfer reactions, nitrogen fixation, metalloenzymes containing magnesium, molybdenum, iron, cobalt, copper and zinc. · 1 mark · Multiple select

Match the active-site metal (Column A) with metalloenzyme (Column B).

A: P Cu; Q Mo; R Co; S Zn.

B: I B12 coenzyme; II carboxypeptidase; III nitrate reductase; IV cytochrome P450; V tyrosinase.

  1. P-V, Q-III, R-I, S-II
  2. P-IV, Q-II, R-I, S-III
  3. P-II, Q-IV, R-V, S-III
  4. P-V, Q-III, R-II, S-IV

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Correct answer: (A) P-V, Q-III, R-I, S-II

Explanation

Tyrosinase contains copper; nitrate reductase uses molybdenum; coenzyme B12 has cobalt; carboxypeptidase has zinc. These assignments give **P–V, Q–III, R–I, S–II, A**. Cytochrome P450 is an iron haem protein and is not a match for the four listed metals.