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One haemoglobin carries how many molecules of `O_(2)` ?

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One haemoglobin carries how many molecules of `O_(2)` ?
A. `4`
B. `2`
C. `6`
D. `8`
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Correct Answer - A
Hb contains a protein portion called globin and a pigment portion called heam. The heam portion consists of four atoms of iron, each capable of combining with a molecule of `O_(2)`, Thus, one Hb carries `4` molecules of `O_(2)`.
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