Q: What are the subunits of insulin hormone?  

Answer: A

Insulin is a peptide hormone that regulates glucose metabolism in the body. It is composed of two peptide chains, called the A and B chains, that are linked by disulfide bonds. The A chain has 21 amino acids, while the B chain has 30 amino acids. The insulin molecule is formed from a single chain precursor called proinsulin, which is cleaved by specific proteases to release the mature insulin molecule.
The mature insulin molecule is a dimer composed of two polypeptide chains, A and B, that are held together by disulfide bonds. The A chain contains two cysteine residues that form a disulfide bond with one of the cysteine residues in the B chain. The other two cysteine residues in the A chain form a disulfide bond with each other. The resulting structure is a dimer composed of two chains, each with an A and a B subunit, held together by two disulfide bonds.

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