All Free Biology MCQs with Answers
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19844 questions · page 708 of 1985
7071. Which one of the following is only a glucocorticoid?
- A. Cortisol
- B. Aldosterone
- C. Corticosterone
- D. Androgen
Explanation: Cortisol is a pure glucocorticoid, regulating metabolism, blood glucose, and stress responses. Aldosterone is a mineralocorticoid.
Correct answer: Cortisol7072. Which one of the following is exclusively a mineralocorticoid?
- A. Cortisol
- B. Aldosterone
- C. Corticosterone
- D. Androgen
Explanation: Aldosterone is the chief mineralocorticoid, maintaining Na+/K+ balance and blood pressure. Cortisol, in contrast, is a glucocorticoid.
Correct answer: Aldosterone7073. All of the following are produced in adrenal gland, except:
- A. Epinephrine
- B. Cortisol
- C. Calcitriol
- D. Androgen
Explanation: Calcitriol (active vitamin D3) is produced in the kidney, not adrenal gland. Adrenal gland produces epinephrine, cortisol, and androgens.
Correct answer: Calcitriol7074. Aggressive behavior during routine life can be a symptom of:
- A. Hyperthyroidism
- B. Overproduction of STH
- C. Overproduction of adrenal cortex
- D. Overproduction of adrenal medulla
Explanation: The excess secretion of epinephrine/norepinephrine from adrenal medulla increases aggression, anxiety, BP, and heart rate.
Correct answer: Overproduction of adrenal medulla7075. Peripheral vasoconstriction is a function of:
- A. Vasopressin
- B. Secretin
- C. Epinephrine
- D. Norepinephrine
Explanation: Norepinephrine causes vasoconstriction by acting on α- adrenergic receptors, helping raise blood pressure during stress.
Correct answer: Norepinephrine7076. Which one is not due to adrenal cortical abnormality?
- A. Addison's disease
- B. Cushing's disease
- C. Failure to cope stress
- D. Tay Sachs disease
Explanation: Tay-Sachs is a genetic lipid storage disorder, unrelated to adrenal cortex. Addison's and Cushing's are adrenal cortical disorders
Correct answer: Tay Sachs disease7077. A tumor in the inner part of adrenal cortex in female results in all except:
- A. Sterility
- B. Male-like characters in female
- C. Over androgen production
- D. High steroid level in blood
Explanation: Tumors of adrenal cortex increase androgens, leading to virilization and high steroids. Sterility is not a direct result.
Correct answer: Sterility7078. The action of epinephrine and nor-epinephrine differs on vessels supplying blood to:
- A. All parts of body
- B. Skin and gut
- C. Brain and muscles
- D. Skin and muscles
Explanation: In stress response, epinephrine and norepinephrine constrict skin/gut vessels to divert blood toward muscles and brain.
Correct answer: Skin and gut7079. Diabetes insipidus is associated with:
- A. Insulin
- B. Glucagon
- C. Glucocorticoid
- D. Vasopressin
Explanation: Diabetes insipidus is due to deficiency or insensitivity of ADH (vasopressin), leading to excessive urination and thirst.
Correct answer: Vasopressin7080. Which one of the following is not a tropic hormone?
- A. TSH
- B. FSH
- C. ACTH
- D. ADH
Explanation: Tropic hormones stimulate other endocrine glands. ADH (vasopressin) acts directly on kidneys, so it is not tropic.
Correct answer: ADH