The promotion phase of carcinogenesis is enhanced by
A) prolonged or repeated exposure to foreign or natural agents that stimulate cell proliferation.
B) inactivation of Ras activity.
C) natural selection of cells exhibiting enhanced growth rate and invasive properties.
D) a single exposure to a carcinogen.
E) a single base-pair change in genomic DNA.
Answer: A
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In the accompanying diagram, F represents the ____
a. stomach b. liver c. pancreas d. gallbladder e. small intestine
A set of symptoms that usually occur together and characterize a disorder is called
a. an abnormality. b. a deviation. c. a syndrome. d. a carrier. e. a pedigree.
If a trait results from genetic variation as well as environmental factors, it is known as a ________ trait
Fill in the blank(s) with correct word
Which of the following molecules is/are produced by translation? Include molecules that are subject to further modification after initial synthesis.
A. The amino acid glycine B. RNA polymerase C. Aminoacyl-tRNA synthetase