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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Examine the figure above. What type of pattern did the human population exhibit through most of its history (prior to the 1700s)?
A. logistic growth
B. exponential growth
C. zero growth (equilbrium)
D. negative growth
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