Comparison of a cancer cell and a normal cell reveals that ____
a. cancer cells undergo contact inhibition, normal cells do not
b. cancer cells do not undergo contact inhibition, normal cells do
c. cancer cells cannot metastasize, normal cells can
d. regulation of mitosis is strictly regulated in cancer cells, mitosis is unregulated in normal
cells.
e. cancer cells remain adherent to other cells, normal cells do not
B
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All algae
a. are unicellular. b. are multicellular. c. have chlorophyll. d. are motile at all stages of their life cycle. e. have life cycles with alternating generations.
The most general of the pituitary hormones, in that it may affect almost any cell in the body, is
a. the adrenocorticotropic hormone. b. the thyroid-stimulating hormone. c. gonadotropin. d. somatotropin. e. prolactin.
Which of the following is the cause of more than half of all deaths in the United States?
A) cardiovascular disease B) flu C) cancer D) diabetes
From a scientific point of view, what are the advantages of studying extinctions as a consequence of historic human action?
a. Historic information helps scientists to date the start of human impact. b. The effects of human action are independent of nonhuman effects. c. Scientists always know the "natural state" of a system prior to human impact. d. The strength of human impact is easy to measure. e. A and B.