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37. Cells that divide and give rise to lymphocytes 39. Which of the following options best describes
are called stem cells. In which of the the type of immunity that results from taking
following structures of the human body do an oral vaccine for polio?
these stem cells carry out their division?
(A) Active natural immunity
(A) Bone marrow (B) Passive natural immunity
(B) Spleen (C) Active artificial immunity
(C) Thymus (D) Passive artificial immunity
(D) Lymph nodes

40. A monoclonal antibody is
Item 38 refers to the following diagram which
illustrates an antibody molecule. (A) a small quantity of several antibodies
(B) made by one particular type of B-
lymphocyte
(C) made by fusing a lymphocyte with a
somatic cell
(D) produced by T cells after exposure
to one particular antigen

41. Long term exposure of the liver to high
concentrations of alcohol eventually results
in liver failure. This is due to the development
of the disease called

(A) Cirrhosis
(B) Multiple sclerosis
38. The two labels which represent the antigen (C) Atherosclerosis
binding site and the region which gives (D) Arteriosclerosis
flexibility in binding to antigens are

(A) 1 and 3
(B) 2 and 3
(C) 3 and 4
(D) 1 and 4

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