Question 1

IgG antibodies have a variety of mechanisms for acting on antigens.

Accepted Answer

A) True 
 B)False

Question 2

You step on something in the yard and get a puncture wound that does not bleed freely. Antigens from any microbes that entered the wound will most likely end up in the

Accepted Answer

A)   appendix.
B)   lymph nodes of the groin.
C)   lymph nodes of the neck (cervical) .
D)   lymph nodes of the armpit (axilla) .
E)   spleen.

Question 3

Which of the following recognizes and binds to MHC II antigens and helps stabilize the binding of antigenic determinants to T cell receptors?

Accepted Answer

A)   CCR3
B)   MHC I
C)   CD26
D)   CD4
E)   CCR5

Question 4

Which of the following statements about lymphocytes is FALSE?

Accepted Answer

A)   Once they are mature, they migrate to secondary lymphoid organs.
B)   B and T lymphocytes can be differentiated under the microscope.
C)   Lymphocytes have integral surface glycoproteins by which they can be recognized.
D)   The glycoproteins on the surface of a lymphocyte are designated with the prefix CD, for "cluster of differentiation."
E)   Lymphocytes have different types of CD molecules in their cytoplasmic membranes.

Question 5

The protozoan that causes malaria is an intracellular parasite of red blood cells (RBCs) . An adaptive immune response to this parasite is problematic because

Accepted Answer

A)   red blood cells do not produce MHC and therefore do not display the fact that they have been infected by presenting antigen.
B)   the parasite damages leukocytes along with RBCs.
C)   RBCs normally produce cytokines necessary for adaptive immune response, which this infection prevents.
D)   complement cannot effectively destroy RBCs.
E)   RBCs never enter lymphoid tissue.

Question 6

Cytokines are soluble regulatory proteins that act as intercellular signals and include substances such as interleukins, interferon, and growth factors.

Accepted Answer

A) True 
 B)False

Question 7

A single B lymphocyte can recognize multiple antigenic determinants.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following statements regarding antibody function is FALSE?

Accepted Answer

A)   They can prevent virus attachment to host cells.
B)   They can facilitate phagocyte attack on bacteria with a capsule (glycocalyx) .
C)   They can penetrate host cells to bind intracellular antigens.
D)   They can facilitate cytotoxic attack by natural killer lymphocytes.
E)   They can bind more than one pathogen at a time, forming large aggregates. C

Question 9

Secretory IgA antibodies are unique because they

Accepted Answer

A)   have unique light chains.
B)   are Y-shaped molecules.
C)   are present in the plasma.
D)   are connected with J chains and short polypeptides to form dimers.
E)   are present in lymph nodes.

Question 10

Which of the following statements about helper T cells is FALSE?

Accepted Answer

A)   They secrete messenger proteins called cytokines.
B)   They are sometimes called T4 cells.
C)   There are two types: Th1 and Th2.
D)   They cannot be distinguished from other T lymphocytes.
E)   They function in conjunction with B cells.

Question 11

A natural killer lymphocyte detects the Fc region of an antibody bound to a cell and responds by releasing __________ and granzyme.

Accepted Answer

perforin

Question 12

Which of the following statements concerning specific immunity is FALSE?

Accepted Answer

A)   It is the third line of defense.
B)   It has memory.
C)   It changes little with repeated exposure to the same pathogen.
D)   It is acquired.
E)   It is the body's ability to respond to specific invading pathogens.

Question 13

Class II MHC (major histocompatibility antigens)  are found on

Accepted Answer

A)   the skin.
B)   red blood cells.
C)   cytoplasmic membranes of nucleated cells.
D)   muscle.
E)   professional antigen-presenting cells.

Question 14

Which of the following statements concerning plasma cells is FALSE?

Accepted Answer

A)   They live a long time and function as memory cells.
B)   They are activated B cells.
C)   They produce 2000 antibodies per second.
D)   They secrete antibody molecules with antigen-determining sites that act only against specific antigen determinants.
E)   The antibodies they produce can remain in circulation for years.

Question 15

Which of the following is true of interferons?

Accepted Answer

A)   They are produced by virally infected cells.
B)   They are involved in B lymphocyte activation and differentiation.
C)   They are involved in chemotaxis of leukocytes.
D)   They are substances used to signal between leukocytes.
E)   They cause basophils and eosinophils to degranulate.

Question 16

The designation "B" for B lymphocytes comes from the

Accepted Answer

A)   fact that these cells produce antibodies.
B)   bone marrow where these cells mature.
C)   fact that these cells are most abundant in the blood..
D)   ability of these cells to provide immunity through bodily fluids.
E)   sequence in which these lymphocytes where discovered. B

Question 17

Describe the mechanisms of action of antibodies.

Accepted Answer

Antibodies act against foreign antigens ...

Question 18

Which of the following function in agglutination?

Accepted Answer

A)   IgA antibodies
B)   IgG antibodies
C)   IgE antibodies
D)   IgD antibodies
E)   IgA and IgG antibodies

Question 19

Compare and contrast clonal deletion and clonal selection of B lymphocytes.

Accepted Answer

Both clonal deletion and clonal selectio...

Question 20

Which of the following molecules would contain T-independent antigens?

Accepted Answer

A)   phospholipids
B)   lipoproteins
C)   polysaccharides
D)   glycoproteins
E)   steroids

Exam 16: Adaptive Immunity

IgG antibodies have a variety of mechanisms for acting on antigens.

Correct AnswerverifiedShow Answer

You step on something in the yard and get a puncture wound that does not bleed freely. Antigens from any microbes that entered the wound will most likely end up in the

Correct AnswerverifiedShow Answer

Which of the following recognizes and binds to MHC II antigens and helps stabilize the binding of antigenic determinants to T cell receptors?

Correct AnswerverifiedShow Answer

Which of the following statements about lymphocytes is FALSE?

Correct AnswerverifiedShow Answer

The protozoan that causes malaria is an intracellular parasite of red blood cells (RBCs) . An adaptive immune response to this parasite is problematic because

Correct AnswerverifiedShow Answer

Cytokines are soluble regulatory proteins that act as intercellular signals and include substances such as interleukins, interferon, and growth factors.

Correct AnswerverifiedShow Answer

A single B lymphocyte can recognize multiple antigenic determinants.

Correct AnswerverifiedShow Answer

Which of the following statements regarding antibody function is FALSE?

Correct AnswerverifiedC

Secretory IgA antibodies are unique because they

Correct AnswerverifiedShow Answer

Which of the following statements about helper T cells is FALSE?

Correct AnswerverifiedShow Answer

A natural killer lymphocyte detects the Fc region of an antibody bound to a cell and responds by releasing __________ and granzyme.

Correct Answerverifiedperforin

Which of the following statements concerning specific immunity is FALSE?

Correct AnswerverifiedShow Answer

Class II MHC (major histocompatibility antigens) are found on

Correct AnswerverifiedShow Answer

Which of the following statements concerning plasma cells is FALSE?

Correct AnswerverifiedShow Answer

Which of the following is true of interferons?

Correct AnswerverifiedShow Answer

The designation "B" for B lymphocytes comes from the

Correct AnswerverifiedB

Describe the mechanisms of action of antibodies.

Correct AnswerverifiedAntibodies act against foreign antigens ...View AnswerShow Answer

Which of the following function in agglutination?

Correct AnswerverifiedShow Answer

Compare and contrast clonal deletion and clonal selection of B lymphocytes.

Correct AnswerverifiedBoth clonal deletion and clonal selectio...View AnswerShow Answer

Which of the following molecules would contain T-independent antigens?

Correct AnswerverifiedShow Answer

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C

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perforin

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B

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Antibodies act against foreign antigens ...
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Both clonal deletion and clonal selectio...
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