Which protein did Davis, Weintraub, and Lassar look for in their fibroblast colonies to positively identify the presence of skeletal muscle cells?

A. collagen
B. myofibril
C. tubulin
D. myosin
E. actin


Answer: D

Biology & Microbiology

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Four of the following characterize most prokaryotes. Which one is the exception?

a. lack of a nucleus b. a single circular chromosome c. cell wall

d. complex internal membranes e. great metabolic diversity

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Pilot fish and sharks have a relationship where the pilot fish eats bits of food that the shark drops or leaves behind. The shark is unaffected by the pilot fish behavior. Which of the following best roles describes the pilot fish?

A. predator B. herbivore C. scavenger D. parasite

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Which of the following is/are true of capsules?

A. They prevent entry of many bacterial viruses. B. They retain water and help prevent desiccation of the bacteria. C. They help bacteria escape phagocytosis by host cells. D. All of the choices are correct.

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Epidemic curves were prepared by plotting number of cases of disease on the Y-axis and dates on the X-axis. Graph would show a sustained increase in cases over a period of time until source is identified and eliminated.

A. Propagated Epidemic B. Point-source Epidemic C. Common-source Epidemic

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