PNB 2265 EXAM III PRACTICE
QUESTIONS AND ANSWERS
Which is the correct sequence of events for activation of specific Helper T cell? -
Correct Answers -1) Presentation of Ag bound to class II MHC on an APC
2) Costimulation = binding of matching nonantigenic proteins in membrane of APC &
helper T
3) APC secretes cytokines that act on helper T (IL-1)
What is the correct sequence of events for activation of a specific cytotoxic T cell during
a primary immune response? - Correct Answers -1) Tc cells recognize Ag bound to
MHC I
Presented by any nucleated cell
2) APC presents MHC II → activates Helper T cells recognize Ag bound to MHC II
proteins
Which is an example of a primary lymph organ?
a. bone marrow
b. lymph node
c. lymphatic vessel
d. all of the the above - Correct Answers -a
Changes in H+ concentration would most likely interfere with the absorption of:
A. amino acids
B. dipeptides - Correct Answers -dipeptide
Due to the presence of multiple epitopes, it is possible that one strain of bacteria may
activate production of one or more type of antibody. - Correct Answers -true
Helper T cell cytokines __________. - Correct Answers -required for clonal expansion in
antibody mediated response
HIV can cause AIDS which results in destruction of helper T cells. If this occurs then
______ immunity is destroyed.
a. cell-mediated immunity
b. antibody mediated immunity
c. both
d. neither - Correct Answers -c
The constant region of an antibody
a. Is on the stem region
b. Is involved in effector mechanisms to eliminate pathogens
c. Is the same on every antibody
QUESTIONS AND ANSWERS
Which is the correct sequence of events for activation of specific Helper T cell? -
Correct Answers -1) Presentation of Ag bound to class II MHC on an APC
2) Costimulation = binding of matching nonantigenic proteins in membrane of APC &
helper T
3) APC secretes cytokines that act on helper T (IL-1)
What is the correct sequence of events for activation of a specific cytotoxic T cell during
a primary immune response? - Correct Answers -1) Tc cells recognize Ag bound to
MHC I
Presented by any nucleated cell
2) APC presents MHC II → activates Helper T cells recognize Ag bound to MHC II
proteins
Which is an example of a primary lymph organ?
a. bone marrow
b. lymph node
c. lymphatic vessel
d. all of the the above - Correct Answers -a
Changes in H+ concentration would most likely interfere with the absorption of:
A. amino acids
B. dipeptides - Correct Answers -dipeptide
Due to the presence of multiple epitopes, it is possible that one strain of bacteria may
activate production of one or more type of antibody. - Correct Answers -true
Helper T cell cytokines __________. - Correct Answers -required for clonal expansion in
antibody mediated response
HIV can cause AIDS which results in destruction of helper T cells. If this occurs then
______ immunity is destroyed.
a. cell-mediated immunity
b. antibody mediated immunity
c. both
d. neither - Correct Answers -c
The constant region of an antibody
a. Is on the stem region
b. Is involved in effector mechanisms to eliminate pathogens
c. Is the same on every antibody
