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Question

One haemoglobin carries how many molecules of O2?
  1. 2
  2. 4
  3. 6
  4. 8

A
2
B
4
C
6
D
8
Solution
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Hb contains a protein portion called globin and a pigment portion called haem. The haem portion consists of four atoms of iron, each capable of combining with a molecule of O2. Thus, one Hb carries 4 molecules of O2.

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