Number of iron atoms present in haemoglobin molecule is

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
Haemoglobin is the respiratory pigment which is present in the RBC. It is made up of four polypeptide subunits, two alpha (α) subunits and two beta (β) subunits. Each subunit is attached to a haeme group which has central iron atom which binds to a oxygen molecule.
So, the correct answer is option D.

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