Microelement required for synthesis of IAA is also a cofactor for which of the following enzyme?

Nitrogenase

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Catalase

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PEP carboxylase

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Carbonic anhydrase

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Solution

The correct option is A Carbonic anhydrase
Zinc is required in the synthesis of auxin, IAA. Zinc also plays an important role by being a co-factor for carbonic anhydrase in facilitating the water to create a proton H+ and a nucleophilic hydroxide ion. The nucleophilic water molecules attack the carbonyl group of carbon dioxide to convert it into bicarbonate.
Thus, the correct answer is 'Carbonic anhydrase'.

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