During the cycling of phosphorus, phosphorus does not enter __________ in appreciable amounts

a. the atmosphere
b. the groundwater
c. organisms
d. marine sediments
e. the ocean


A

Biology & Microbiology

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Although heavy metals are no longer widely used as germicides, ________ is an effective algicide in lakes and swimming pools.

A. mercuric chloride B. silver nitrate C. lead acetate D. copper sulfate

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Which of the following function as blood volume

reservoirs because of their great distensibility? a. veins and venules b. arteries c. arterioles d. capillaries e. all of these

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A form of mutation associated with the expansion in copy number of a nucleotide triplet in or near a gene is called

a(n) ____________________ Fill in the blank(s) with the appropriate word(s).

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Which statement about cancer defense is FALSE?

a. Natural killer and T cytotoxic cells destroy cancer cells. b. Cancer antigens stimulate a strong immune response. c. Monoclonal antibodies can deliver toxic drugs to cancer cells.

d. T cells produce interleukins, which defend against cancer. e. Macrophages produce tumor necrosis factor, which inhibits tumor growth.

Biology & Microbiology