Multiple choice

How many molecules of oxygen are carried in haemoglobin?

  1. 4

  2. 2

  3. 6

  4. 8
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A Correct answer
Explanation

Each chain contains one heme group each of which contains one iron ion. The iron is the site of oxygen binding. Each iron can bind one O2 molecule. Thus, each haemoglobin molecule is capable of binding a total to four O2 molecules.

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