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Exam (elaborations) BIO Biological Science sample test with solutions
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BIOLOGICAL SCIENCE MCQS solved1. The following are true about tight junction:
a. it forms a barrier to water
b. it is found in the blood-aqueous barrier of the ciliary body
c. it is found in the blood-retinal barrier at the apex of the retinal pigment epithelium
d. all above
Correct Answer: d
2. The following are true about the dural venous sinuses:
a. they have no valve
b. the cavernous sinus is closely related to the pituitary gland
c. the cavernous sinus has the first two divisions of the trigeminal nerve on its lateral wall
d. all above
Correct Answer: d
3.True statements about the cerebral blood flow include:
a. it is constant for the blood pressure in the range between 50-150mmHg
b. hypocapnia causes vasoconstriction
c. cerebral arterioles constricts when the blood pressure raises
d. all above
Correct Answer: d
4. The following reflexes are used to test for brain stem death:
a. knee jerk reflex
b. Babinski's reflex
c. gag reflex
d. pupil reflex
Correct Answer: c,
5. In injury of the peripheral nerve:
a. pure sensory or pure motor nerve tends to regenerate better than mixed nerve
b. in neuropraxia, there is anatomical disruption of the nerve
c. Wallerian degeneration occurs 3 days after the injury
d. Wallerian degeneration occurs proximal to the site of the injury
Correct Answer: a,
6. The blood - brain barrier:
a. is permeable to bilirubin at birth
b. is formed by the tight junctions between endothlial cells and the end feet processes of
astrocytes
c. is permeable to glucose
d. all above
Correct Answer: d
7. The following are true about DNA synthesis:
a. it requires DNA polymerase
, b. reverse transcriptase enzymes are involved
c. moves in a 5'---> 3' direction
d. the rate of error in DNA synthesis is 1 in 105 base pairs
Correct Answer: a,
8. With regard to DNA molecules:
a. they contain adenine, cytosine, guanine and uracil bases
b. they can be detected with Western blotting
c. they can be detected with Southern blotting
d. they are denatured at temperature of 1000C
Correct Answer: c,
9. G-proteins:
a. are activated by the binding of an extracellular ligand to a membrane receptor
b. can be mutated in tumour cells
c. mediate the action of glucocorticoid hormone
d. they are inactivated by cholera toxins.
Correct Answer: a,
10. The following is true about gluconeogenesis:
a. it occurs in liver
b. it occurs in kidney
c. it occurs in adipose tissue
d. it is inhibited by glucagon
Correct Answer: a,
11. With regard to membrane receptors for hormones:
a. they are often glycoproteins
b. they are important for hormones made up of steroid
c. those for insulin exhibit an intrinsic protein kinase activity
d. glucagon uses calcium as a second messenger
Correct Answer: a,
12. With regard to interferons:
a. they are produced by B lymphocytes
b. IFN-gamma is produced by cells infected with virus
c. IFN-gamma increases MCH class I and II expression in antigen presenting cell
d. IFN-gamma is produced by fibroblasts
Correct Answer: b,
13. The following are true about interleukins 1 (IL-1):
a. it is produced mainly by the neutrophils
b. it stimulates the proliferation of B and T cells
c. it increases bone production
d. it acts on the hypothalamus to cause fever
Correct Answer: b,
14. With regard to interleukins:
a. IL-2 is produced mainly by CD8+ cells
b. IL-3 stimulates the growth of haemopoietic stem cells
c. IL-4 increases the production of IL-1
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