Immunoglobulin A (IgA) is mainly found
A. in the bloodstream
B. in the spleen
C. in the thymus
D. on body mucous membranes
E. on body skin
Ans: D. on body mucous membranes
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Which statement is NOT true concerning natural selection?
A. Natural selection acts on an individual's phenotype as it interacts with the environment. B. Natural selection has a strong effect on non-heritable traits. C. Reproduction plays an important role in the process of natural selection. D. Darwin popularized the term by contrasting it with artificial selection, or selective breeding.
B cells are the main cells of the cell-mediated pathway
a. true b. false
The difference between T cell activation by normal antigens and T cell activation by superantigens is that superantigens
A) suppress cytokine release. B) are not processed and presented by APCs. C) are not processed and presented by APCs and cause nonspecific activation of many T cells at once, including those that would not normally recognize the antigen. D) cause nonspecific activation of many T cells at once, including those that would not normally recognize the antigen and suppress cytokine release. E) cause nonspecific activation of many T cells at once, including those that would not normally recognize the antigen.
Proteins produced by Escherichia coli can prevent the growth of pathogenic bacteria such as Salmonella and Shigella. This is an example of _________________________.
A) Microbial association B) Microbial inhibition C) Microbial antagonism D) Microbial immunity E) Microbial resistance