Which of the following statements is false?
a. Cytotoxic T cells kill body cells that have been
invaded by pathogens.
b. The cell-mediated response is ineffective against
a pathogen that has already entered the
cytoplasm of a body cell.
c. Cytotoxic T cells are produced by the bone
marrow but mature in the thymus gland.
d. Cytotoxic T cells are unable to destroy freefloating
viruses they encounter in the
bloodstream.
e. Cytotoxic T cells secrete perforins that are able
to punch holes in infected cells.
Answer: b
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D. negative growth
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