Humoral immunity, which is based on the antigen—antibody response, is brought about by which type of cell?

A) Macrophages
B) B cells
C) T cells
D) Natural killer cells

B) B cells
B) Humoral immunity is based on the antigen antibody response. B cells, which are responsible for humoral immunity, produce circulating antibodies to act against an antigen.

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Which of the following would you be most capable of changing to reduce your risk of coronary heart disease (CHD)?

A). Gender B). Diet C). Ethnicity D). Family history

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What theory of radiation damage to cells results from free radicals combining to form toxins such as hydrogen peroxide?

a. Primary b. Secondary c. Indirect d. Direct

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