A fresh set of 20 random questions is generated every time you open this page and every time you refresh it.For each of the following multiple choice questions, choose the most appropriate answer :
1. Neuron C responds to stimulation of neuron A with a propagated action potential only when neuron B (which terminates only on neuron C) is also simultaneously stimulated. Which of the following inferences is justified?
A. Neuron B releases an excitatory neurotransmitter.
B. The neurotransmitter released by neuron A opens K channels in neuron C.
C. Neuron C releases glycine.
D. The synapse between A and C is axosomatic.
2. The maternal growth hormone of pregnancy is:
3. Physiologically, an intact innervated muscle can normally be made to contract by stimulation of which of the following neurons innervating that muscle?
A. ?-motor neurons
B. ?-motor neurons
C. ?-motor neurons
D. Either A or C
4. The testis-determining gene (or the SRY gene) is located normally on/in:
A. Chromosome 6
B. Chromosome 12
C. Short arm of chromosome 22
D. Y chromosome
5. Micelles in bile are formed by:
A. Bile acids and bile salts
B. Cholesterol and bile salts
C. Bile salts and phospholipids
D. Cholesterol and phospholipids
6. Which of the following types of cells work as scavenger cells in the CNS?
C. Ependymal cells
7. Which of the following statements is incorrect?
A. Muscles can lengthen while doing work.
B. Isometric contractions do work whereas isotonic contractions do not.
C. Contraction can occur without an appreciable decrease in the length of the muscle.
D. Contraction against a constant load with approximation of the ends of the muscle is called isotonic contraction.
8. In order for a muscle to contract properly, it requires
A. An adequate blood supply.
B. All of the above
9. Which of the following hormones has the highest mineralocorticoid activity?
10. Hyperthyroidism following administration of large amounts of iodine (iodine induced hyperthyroidism; Jod-Basedow mechanism) is least likely in an individual with:
B. Endemic (iodine deficiency) goiter
C. Hashimoto's thyroiditis
D. Graves' disease
11. Decreased Basal Metabolic Rate is seen in:
12. Sperm cells first acquire the ability to move forward (progressive motility) in the:
A. Seminiferous tubules
C. Female genital tract
D. All these
13. Bile acids are synthesized starting from:
B. Fatty acids
D. Bile salts
14. The "penis-at-12" syndrome occurs due to a deficiency of:
A. 17a hydroxylase
B. Testosterone 5a reductase
C. 11ß hydroxysteroid dehydrogenase
D. CYP 450scc
15. Bile salts are essential for absorption of fat because they:
A. Solubilize dietary lipids in micelles
B. Increase surface tension
C. Are hydrophobic
D. Contain pancreatic enzymes
16. ECF volume is determined by:
A. Plasma [Na]
B. Plasma protein concentration
C. The amount of sodium in the ECF
D. All these
17. The hypertensive form of congenital adrenal hyperplasia is due to a deficiency of:
A. DHEA sulfokinase
B. 3ß-hydroxysteroid dehydrogenase
C. 11ß hydroxylase
D. 21 hydroxylase
18. The Oral Rehydration Solution is helpful in rehydration in diarrheas because:
A. 1Na-1K-2Cl symporter is located only in the basolateral membrane
B. Na-glucose symporter is unaffected in toxigenic diarrheas
C. CAMP regulated Cl secretion is reduced
D. Toxins inhibit facilitated glucose transport
19. Ryanodine receptor is located in the:
C. Terminal cisterns of sarcoplasmic reticulum
20. The formation of mature sperm cells from a primitive germ cell takes an average of:
A. 2 days
B. 1 week
C. 74 days
D. 3 months
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