Certain small towns in the western United States have remained isolated and inbred since their settlement many years ago. Some alleles are more common in these communities as compared to the rest of the population. This effect is known as
A. disrupting selection.
B. Hardy-Weinberg principle.
C. founder effect.
D. artificial selection.
E. directional selection.
Answer: C
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The term neoplasia refers to cell accumulation. Neoplasia can be caused by
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In addition to several other factors, the overall risks of environmental chemicals depend on genetically determined variations in the ____ involved in transport, metabolism, and excretion of these chemicals
a. proteins b. body's oxygen levels c. body's pH d. ribosomes e. disaccharides
A yeast artificial chromosome (YAC) is a ____ that can accommodate large DNA inserts and uses the eukaryote yeast as a host cell
a. restriction enzyme produced from yeast chromosomes b. labeled nucleic acid used to identify a clone within a genome and c. q arm of chromosome 15 within a cell that encodes for a restriction enzyme and d. cloning vector that has telomeres and a centromere e. cloning vector that has 23 chromosomes
Which of the following statements does not pertain to Streptococcus pyogenes?
A. It is often spread from an endogenous source. B. It causes gas gangrene. C. It secretes streptokinase. D. It causes impetigo. E. It coats itself with host proteins.