Chemotaxis is a process by which bacteria
A. respond metabolically to the presence of autoinducer molecules.
B. avoid phagocytosis.
C. move on solid surfaces by means of type IV fimbriae.
D. move toward an attractant or away from a repellent.
Answer: D
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Normally, human fertilization occurs in the ____
a. vagina b. cervix c. ovary d. uterus e. oviduct
When the rodenticide warfarin was first introduced, rats were very susceptible to it. The development of resistance to
warfarin by rats was the result of a. special creation. b. natural selection of individuals that expressed genes for resistance. c. the high biotic potential of insects. d. a naturally occurring example of inheritance of acquired characteristics. e. mutation induced by DDT.
Exchange between blood and interstitial fluid occurs across capillaries and, to a lesser extent
A) veins. B) metarterioles. C) venules. D) arteries. E) arterioles.
Which of the following is a eukaryote involved in foodborne illness?
A) Toxoplasma gondii B) Campylobacter jejuni C) Listeria monocytogenes D) Yersinia enterocolitica E) Naegleria fowleri