GATE 2019 CY – Question 42

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. · 2 marks · Multiple choice

Match P ferritin, Q rubredoxin, R cobalamin, S carbonic anhydrase to I electron transfer, II acid–base catalysis, III metal storage, IV methyl transfer.

P–III, Q–II, R–I, S–IV
P–III, Q–I, R–IV, S–II
P–IV, Q–I, R–III, S–II
P–IV, Q–II, R–I, S–III

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Correct answer: (B) P–III, Q–I, R–IV, S–II

Explanation

Ferritin stores iron (III). Rubredoxin transfers electrons through its iron centre (I). Cobalamin cofactors participate in methyl transfer (IV). Carbonic anhydrase uses zinc-bound water/hydroxide for acid–base catalysis in CO₂ hydration (II). The matching is B.

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