What describes only the quaternary structure of haemoglobin?
1) $\alpha - $helix
2) a dipeptide
3) a globular structure
4) the specific order of amino acids
5) four polypeptide chains joined together
1 )
1, 2 and 3
2 )
2, 4 and 5
3 )
1 and 4
5 only
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