A piece of meat and a piece of fruit are fed to both a lizard and a person. The extent to which these foods are digested by digestive enzymes along these two gastrointestinal tracts varies. Which of the following is not a reason for the variation in digestion?

a. pH of the digestive organs
b. body temperature
c. variation in enzymes produced
d. the amount of protein in the meat and fruit
e. bacteria present in the digestive tract


d. the amount of protein in the meat and fruit

Biology & Microbiology

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The filamentous bacteria that grow on the dorsal surface of certain polychaete worms

A. fend off potential predators with toxins. B. may provide the worm with protection from toxic metals. C. carry out photosythesis. D. All of the choices are correct.

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Which stage of the Plasmodium life cycle does label D represent?

a. sporozoite b. gametocyte c. cyst d. zygote e. merozoite

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The extinction of the wooly mammoth about 10,000 years ago—due to human hunting and climate change—is an extreme example of ________ regulation.

a. density-dependent b. density-independent c. r-selected d. K-selected

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Beginning with the heart, which is the correct order of blood flow, as represented by steps 1-5 in the flow chart below?

a. capillaries, venules, veins, arteries, arterioles b. arterioles, arteries, venules, veins, capillaries c. arteries, arterioles, capillaries, venules, veins d. veins, venules, capillaries, arterioles, arteries e. arteries, veins, arterioles, capillaries, venules

Biology & Microbiology