Question

Which of the following is/are peptide hormone(s)?

• A. Calcitonin
• B. Glucagon
• C. Serotonin
• D. Thyroxine

Hint:

Peptide hormones are made up of chains of amino acids. Examples include glucagon and calcitonin. Thyroxine, however, is not a peptide hormone, as it is derived from tyrosine.

Answer 1

The Correct Option is A, B

Peptide hormones are composed of amino acid chains and function as signaling molecules in the body. Let's analyze the options:
- (A): Calcitonin is a peptide hormone produced by the thyroid gland. It helps regulate calcium levels in the blood by inhibiting bone resorption. Thus, statement (A) is correct.
- (B): Glucagon is a peptide hormone produced by the pancreas. It raises blood glucose levels by promoting the conversion of glycogen to glucose. Hence, statement (B) is correct.
- (C): Serotonin is a neurotransmitter, not a peptide hormone. It is derived from the amino acid tryptophan but is not classified as a peptide hormone. Therefore, statement (C) is incorrect.
- (D): Thyroxine (T4) is a thyroid hormone but is derived from tyrosine and iodine, not from peptides. Therefore, statement (D) is incorrect.
Thus, the correct answers are (A) and (B).