Biology, Eighth Edition (Raven)

Chapter 51: The Immune System

Post Test

1
An important characteristic of the skin that helps as a defense against pathogens is: (p.1040)
A)its thickness.
B)its pH of 8-9.
C)its dryness.
D)its pH of 3-5.
E)none of the above
2
A fever: (p. 1042)
A)results from the metabolic activity of the leukocytes breaking down pathogens.
B)promotes the activity of phagocytic cells.
C)results from interleukin-1 released by macrophages stimulating the hypothalamus.
D)is a non-adaptive response.
E)both b and c
3
What happens to the small percentage (10%) of B cells that do not bind to stromal cell epitopes on bone marrow cells? (p 1048)
A)They will undergo apoptosis.
B)They will travel to the thymus where they will complete their maturation into T cells.
C)They will be reabsorbed.
D)They will be released from the bone marrow into the blood.
E)none of the above
4
Cytotoxic T cells: (p. 1050)
A)target and destroy cells of the body.
B)secrete interleukin-1.
C)destroy bacteria directly.
D)both a and b
5
What is the first immunoglobulin antibody secreted during the primary immune response? (p. 1055)
A)IgA
B)IgG
C)IgE
D)IgM
E)IgD
6
On exposure to an allergen B cells are activated by ______ to secrete ____ antibodies. (p. 1059)
A)TC cells/IgG
B)TH cells/IgE
C)the foreign protein/IgE
D)macrophages/IgM
E)TH cells/IgM
7
Monoclonal antibodies: (p. 1061)
A)are specific for one epitope.
B)are produced by genetic engineering.
C)can be used for diagnosis and treatment of diseases.
D)are very difficult to produce.
E)both a and c
8
Human immunodeficiency virus (HIV) is particularly difficult to combat because: (p. 1064)
A)it is a retrovirus.
B)it attacks the TH cells.
C)it eventually destroys the immune system.
D)all of the above
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