Question

Select the peptide hormone(s) from the following options.

• A. Cortisol
• B. Testosterone
• C. Oxytocin
• D. Insulin

Hint:

Steroid hormones come from cholesterol; peptide hormones come from a chain of amino acids.

Answer 1

The Correct Option is C, D

Step 1: Recall what a peptide hormone is.
A peptide hormone is a hormone built from a chain of amino acids, made by ribosomes and stored in secretory vesicles before release.
This is different from a steroid hormone, which is built from cholesterol and can pass straight through the cell membrane.

Step 2: Classify each option.
Cortisol is a steroid hormone made from cholesterol in the adrenal cortex, so it is not a peptide hormone.
Testosterone is also a steroid hormone, made in the testes from cholesterol, so it is not a peptide hormone either.
Oxytocin is a small peptide hormone made of nine amino acids, released by the posterior pituitary, so it is a peptide hormone.
Insulin is a protein hormone made of two linked amino acid chains, released by the pancreas, so it is a peptide hormone.

Step 3: Pick the peptide hormones.
Only oxytocin and insulin are peptide hormones among the four options.

Final Answer:
Oxytocin and Insulin are the peptide hormones. \[ \boxed{\text{(C), (D)}} \]