How many molecules of oxygen can associate with a molecule of haemoglobin?

One

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Two

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Three

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Four

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Solution

The correct option is D
Four

Each chain contains one haeme group, each of which contains one iron atom. The iron is the site of oxygen binding. Each iron can bind one $O_{2}$ molecule and thus, each haemoglobin molecule is capable of binding a total to four $O_{2}$ molecules.

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