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 The ability to mount an efficient secondary antibody response depends on a

Biology

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 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.