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Q.
How many haeme molecules are present in one molecule of haemoglobin?
AFMCAFMC 2010Body Fluids and Circulation
Solution:
Haemoglobin is one of a group of globular proteins occurring widely in animals as oxygen carriers in blood. Vertebrate haemoglobin comprises two pairs of polypeptide chains, known as $\alpha$-chains and $\beta$-chains (forming the globin protein) with each chain folded to provide a binding site for a haem group. Each of the four haem groups binds one oxygen molecule to form oxyhaêmoglobin.