Which feature of haemoglobin makes it a globular protein?
1 )
It has four cross-linked polypeptide chains forming a quaternary structure.
It has hydrophobic groups on the inside and hydrophilic groups on the outside.
3 )
It has hydrophobic interactions and is insoluble in water.
4 )
It has polypeptide chains which are cross-linked to form sheets.
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