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
You might also like to view...
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
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
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).
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.