The hormone that stimulates the release of growth hormone from the pituitary is: MCQ with Answer and Explanation

The hormone that stimulates the release of growth hormone from the pituitary is:
A. Dopamine
B. Cortisol
C. Somatostatin
D. Growth hormone-releasing hormone (GHRH)
Answer: Option D
Solution (By JKExamLibrary)
GHRH, from the hypothalamus, stimulates the anterior pituitary to secrete growth hormone. Somatostatin inhibits GH release. Dopamine inhibits prolactin.

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Question #1
The process of artificially introducing weakened pathogens to stimulate immunity is called:
A. Antibiosis
B. Immunotherapy
C. Vaccination
D. Chemotherapy

Correct Answer: Option C


Explanation:
Vaccination (immunization) involves administering killed or attenuated pathogens, or their antigens, to induce active artificial immunity without causing disease. It primes the immune system to produce memory cells. Antibiosis is inhibition by another organism, immunotherapy treats disease by modulating immune response, chemotherapy uses drugs against cancer or microbes.

This question belongs to: Science Biology
Question #2
The enzyme that converts glucose into ethanol in yeast is:
A. Lactase
B. Zymase
C. Maltase
D. Invertase

Correct Answer: Option B


Explanation:
Zymase is the enzyme complex in yeast that catalyzes alcoholic fermentation, converting pyruvate to ethanol and CO₂. Invertase hydrolyzes sucrose, lactase breaks lactose, maltase breaks maltose. Zymase activity is exploited in baking and brewing industries.

This question belongs to: Science Biology
Question #3
The deficiency of vitamin B₁₂ often results from lack of which gastric factor?
A. Intrinsic factor
B. Hydrochloric acid
C. Pepsinogen
D. Mucus

Correct Answer: Option A


Explanation:
Intrinsic factor, a glycoprotein secreted by gastric parietal cells, binds to vitamin B₁₂ and facilitates its absorption in the ileum. Absence or deficiency (pernicious anemia) leads to B₁₂ deficiency, causing megaloblastic anemia and neurological symptoms. HCl activates pepsin, pepsinogen is precursor, mucus protects.

This question belongs to: Science Biology