Biology (Raven), 9th Edition

Chapter 52: The Immune System

Post-Test

1
While T cells mature in the _______, B cells mature in the _______.
A)spleen; thymus
B)lymph nodes; bone marrow
C)thymus; lymph nodes
D)thymus; bone marrow
E)bone marrow; spleen
2
An important characteristic of the skin that helps as a defense against pathogens is:
A)its thickness.
B)its pH of 8-9.
C)its dryness.
D)its pH of 3-5.
E)none of these
3
A fever:
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)More than one of these is correct.
4
What happens to the small percentage (10%) of B cells that do not bind to stromal cell epitopes on bone marrow cells?
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
5
Cytotoxic T cells:
A)target and destroy cells of the body.
B)secrete interleukin-1.
C)destroy bacteria directly.
D)mature in the bone marrow.
E)none of these.
6
What is the first immunoglobulin antibody secreted during the primary immune response?
A)IgA
B)IgG
C)IgE
D)IgM
E)IgD
7
On exposure to an allergen, B cells are activated by ______ to secrete ____ antibodies.
A)TC cells/IgG
B)TH cells/IgE
C)the foreign protein/IgE
D)macrophages/IgM
E)TH cells/IgM
8
Monoclonal antibodies:
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)are specific for one epitope AND can be used for diagnosis and treatment of disease.
9
Human immunodeficiency virus (HIV) is particularly difficult to combat because:
A)it is a retrovirus.
B)it attacks the TH cells.
C)it eventually destroys the immune system.
D)attempts to create vaccines have met with little success.
E)all of the above
10
The skin is home to bacteria and fungi. All of these are potentially harmful.
A)True
B)False
11
Natural killer cells:
A)attack invading microbes directly.
B)kill by phagocytosis.
C)are the most abundant of leukocytes.
D)kill cells of the body that have been infected with viruses.
E)none of the above
12
Antigens:
A)provoke specific immune responses.
B)may be large, complex proteins.
C)may be components of foods.
D)may have many different parts.
E)all of the above
13
In humans the major histocompatibility complex (or MHC):
A)encodes human leukocyte antigen proteins.
B)is extremely polymorphic.
C)allows self versus non-self recognition.
D)encode peptides recognized by T cells.
E)all of the above
14
What are the B cell receptors for antigens?
A)cytokines
B)interleukin
C)immunoglobulins
D)interferon
E)none of the above
15
It is impossible for the immune system to attack the animal's own tissues and cause death.
A)True
B)False
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