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The ability to mount an efficient secondary antibody response depends on a
The ability to mount an efficient secondary antibody response depends on
a. Memory T and B cells
b. High concentrations of IgA antibody
c. Cross-linking of IgM antibodies
d. All of the above are correct
I choose answer (d)
32. A natural barrier to the intestine is provided by the extremely alkaline environment of the stomach contents. (Does the alkalinity of the stomach provide a natural defense against disease?)
a. True
b. False
My choice is False since the stomach is acidic.
Expert Solution
For 29, you have chosen the incorrect answer. The correct answer is A. A secondary response relies on the presence of previously activated B and/or T cells that have developed into memory cells. These are able to respond to an infection faster than naive (never-activated) B/T cells. B and C play no role in this process. IgA is the antibody found at mucosal sites (eg: in milk), while IgM is the antibody subclass employed early in a response.
For 32, I would agree with your reasoning. The acidity of he stomach does provide a barrier against infection, but it appears to be a trick question.
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