Biology 9700/s15/12

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What describes only the quaternary structure of haemoglobin?
1 α-helix
2 a dipeptide
3 a globular structure
4 the specific order of amino acids
5 four polypeptide chains joined together
A 1, 2 and 3 B 2, 4 and 5 C 1 and 4 D 5 only

How do we get the answer as D
 
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