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Identify the polypeptide subunit present...

Identify the polypeptide subunit present in the adult haemoglobin

A

Two `alpha`-and two `beta`-subunits

B

Four `alpha`-subunits

C

Four `beta`-subunits

D

Three `alpha`-subunits and one `beta`-subunits.

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The correct Answer is:
A
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