The developing embryo in Figure 51-2 is representative of development in:

a. a bird.
b. an annelid.
c. a sea star.
d. a frog.
e. a mammal


D

Biology & Microbiology

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Ste5 binds to MAPKKK, MAPKK, and MAPK to organize the kinase cascade. What type of signaling molecule is Ste5?

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Which skeleton moves in response to muscular

contraction?

a. endoskeleton b. exoskeleton c. hydrostatic skeleton d. all of these e. none of these

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Urine formed by a kidney collects in the ____ before being drained from the kidney by the ____ and transported to the _____.

Fill in the blank(s) with the appropriate word(s).

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Most known microorganisms maintain their internal pH ________.

A. near neutral (pH 7) B. slightly alkaline (pH 8-10) C. slightly acidic (pH 4-6) D. near their optimum growth pH

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