What is one piece of evidence that supports the hypothesis that cancers are clonal?
What is one piece of evidence that supports the hypothesis that cancers are clonal?
A) A tumor grows in a single anatomical site.
B) All cells from the same cancer have identical mutations.
C) All cells from the same tumor have identical karyotypes.
D) All cancer cells from a heterozygous woman have the same X chromosome inactivated.
E) Individuals of all ages, including children, can develop cancer.
D) All cancer cells from a heterozygous woman have the same X chromosome inactivated.
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A chromosomal mutation where a segment breaks off, flips, and then reattaches itself is called a(n):
A. inversion. B. duplication. C. translocation. D. deletion. E. reciprocal translocation.
Which of the following could be found in or on the nasal epithelium of mammals?
A. a layer of mucus B. olfactory receptors C. basal cells that give rise to olfactory receptors D. supporting cells between olfactory receptor cells E. All of these choices are correct
Which one of the following methods of antimicrobial susceptibility testing is the most popular method in the United States? (Note: information about susceptibility testing can be found on the CD-ROM that accompanies this book.)
A) agar dilution method B) disk-diffusion method C) macro broth dilution method D) micro broth dilution method
Which of these would be an effect of an excess of thyroid hormones?
A) More thyroid hormone would be produced. B) A would release less TRH. C) B would release more TSH. D) The thyroid would swell and produce a goiter.