Question

What is Insulin chemically?

• A. Carbohydrate
• B. Lipid
• C. Protein
• D. Vitamin

Hint:

Hormones like insulin, glucagon, and growth hormone are all proteins. Remember: if it's made of amino acids and performs biological signaling, it's most likely a protein.

Answer 1

The Correct Option is C

Insulin is a vital hormone secreted by the pancreas, particularly by the beta cells of the islets of Langerhans. Its function is to regulate blood glucose levels by promoting the uptake of glucose into cells and stimulating the liver to store glucose as glycogen. Chemically, insulin is a:

• Peptide hormone, i.e., a short chain of amino acids.
• It consists of two polypeptide chains — A and B chains — linked by disulfide bonds.
• This structure makes it a protein by chemical classification.

Thus, insulin is not a carbohydrate, lipid, or vitamin, but a protein hormone made of amino acid sequences. \[ \boxed{\text{Insulin is chemically a protein}} \]