Discussion
Carbonic anhydrase is an example of
Answer: A
Carbonic anhydrase is classed among the options as a hydrolysis enzyme.
It is a zinc enzyme that catalyses the reversible hydration of carbon dioxide, CO2 + H2O ⇌ HCO3− + H+. The Zn2+ ion, held by three histidines, binds and activates a water molecule (as Zn-OH) that attacks CO2; inorganic chemistry texts group it with the zinc hydrolytic enzymes such as carboxypeptidase. Formal enzyme nomenclature lists it as a hydro-lyase, but of the four options only this one fits.
It is not a redox enzyme, since Zn2+ has a full d shell and does not change oxidation state. It does not carry O2 (haemoglobin, myoglobin and haemocyanin do), and it has no heme group.
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