The only endocrine glands that lay dormant during childhood to activate at puberty are the:

Correct Answer: D

Rationale: The ovaries and testes (gonads) remain largely inactive until puberty, when they begin producing sex hormones triggered by pituitary signals.

Correct Answer: A

Rationale: Hormones are amines (e.g., epinephrine), peptides (e.g., insulin), or steroids (e.g., cortisol).

Correct Answer: D

Rationale: Steroids and thyroid hormone act via nuclear receptors to induce protein synthesis.

Correct Answer: C

Rationale: Negative feedback occurs when hormone B inhibits its stimulator (hormone A).

Correct Answer: A

Rationale: Vasopressin is a hypothalamic neurohormone released by the posterior pituitary.