Insulin is a globular protein involved in cell signalling. It is transported in the blood plasma from the cells that synthesise it to its target cells. A molecule of insulin contains six sulfur-containing amino acids and has two polypeptide chains.
Which statements about insulin are correct?
1- An insulin molecule has a quaternary structure.
2- Insulin polypeptides are held together by six disulfide bonds.
3- Amino acids with hydrophobic R groups would be found in the centre of an insulin molecule.
1 )
1, 2 and 3
2 )
1 and 2 only
1 and 3 only
4 )
2 and 3 only
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