In which ways do memory B cells active in a secondary immune response differ from the naive B-cell population activated in a primary immune response? (Select all that apply.)
a. The antibody produced is of higher affinity in a secondary immune response.
b. The frequency of antigen-specific B cells is lower in a secondary immune response.
c. The level of somatic hypermutation is higher in a secondary immune response.
d. Higher levels of IgM are produced in secondary immune responses.
e. B cells do not require T-cell help in secondary immune responses.
f. Memory B cells express higher levels of MHC class II molecules.
g. Naive B cells express higher levels of co-stimulatory molecules.
a, c, f
You might also like to view...
The surge of blood in an artery caused by the heart contraction is the
a. pulse. b. blood pressure. c. aneurysm. d. pacemaker.
Anything that invades the body and causes the immune system to react is a(n):
(a) antigen (b) phagocyte (c) antibody (d) lymphocyte
The prefix for beside is:
A. Exo- B. Para- C. Apo- D. Intra-
In one-rescuer CPR, you should stop after two minutes to:
A) rest. B) change hand positions. C) assess for signs of life. D) give 5 rescue breaths.