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Question

Insulin is a/an.

A
Polysaccharide
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B
Protein
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C
Amino acid derivative
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D
Lipid
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Solution

The correct option is B Protein
Insulin is a large popylpeptide hormone and is insoluble in lipids, therefore, it cannot enter the target cell. It acts at the cell surface. It operates through extracellular membrane bound receptor, a heterotetrameric protein (extrinsic protein) on the target cell.

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