The hormone ________ regulates the synthesis of HCl by parietal cells.
A. insulin
B. gastrin
C. glucagons
D. pepsin
Answer: B
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Prokaryote means before the nucleus, but what general feature co uld prokaryotes also be said to lack? What will be an ideal response?
Argentine fire ants entered the United States in
the a. 1920s. b. 1930s. c. 1940s. d. 1950s. e. 1960s.
Cloning a gene involves all of the following EXCEPT ________.
A. insertion of the gene into an appropriate vector B. isolating the fragment of DNA containing the desired gene C. introducing ligated DNA into E. coli cells D. expression of the vector and the gene in a cell-free environment
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.