Q.

Haemoglobin has highest affinity for –

A. Oxygen
B. Carbon dioxide
C. Carbon monoxide
D. Nitrogen
Answer» A. Oxygen
Explanation: Haemoglobin has greatest affinity for oxygen with which it binds readily. The oxygen binding properties of hemoglobin exist because of the interaction between oxygen andthe iron atom of the heme groups and hemoglobin's quaternary structure.
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