Carbon dioxide entering erythrocytes reacts with water to form carbonic acid. The enzyme is?

Carbonic anhydrase

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Carboxypeptidase

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Hydrolase

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Oxidoreductase

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Solution

The correct option is A Carbonic anhydrase
Carbonic anhydrase, which is found within red blood cells, catalyzes a reaction converting $C O_{2}$ and water into carbonic acid, which dissociates into protons, and bicarbonate ions. When a $C O_{2}$ enters the active site of the enzyme, it gains an $O H^{-}$ that was bonded to the zinc, forming carbonic acid that is then released.

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1. Carbonic anhydrase is present in the erythrocytes.

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