On which human skin protein do fungal infections typically feed?

a. collagen
b. elastin
c. myosin
d. keratin
e. pepsin


ANSWER: d

Biology & Microbiology

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Which of the following are unique characteristics or components of the adaptive—but not innate—immune system? Select all correct choices

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Based on the fact that CO2 limits photosynthesis in some current environments, what might you conclude about the evolution of photosynthesis?

A. Photosynthesis evolved when environmental concentrations of CO2 were low. B. Photosynthesis evolved when environmental concentrations of CO2 were high. C. CO2 levels likely did not have a bearing on the evolution of photosynthesis. D. Photosynthesis evolved in a greenhouse.

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The encysted larva of the beef tapeworm is called a

A) redia. B) cercaria. C) cysticercus. D) metacercaria. E) proglottid.

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Hydrogen bonds are very important in the functional shape of:

A) proteins and nucleic acids. B) nucleic acids. C) sugars. D) proteins. E) fats.

Biology & Microbiology