Passage of animal cells through the cell cycle is regulated primarily by

a. the availability of nutrients.
b. intracellular second messengers.
c. extracellular growth factors.
d. direct cell surface interactions.


Ans: c. extracellular growth factors.

Biology & Microbiology

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a. phosphodiester b. disulfide c. glycosidic d. hydrogen e. peptide

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In photosynthesis, the net uptake of CO2 by a plant is greatest

A) when PAR equals zero. B) at the light compensation point. C) during photoinhibition. D) at the light saturation point.

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DNA isolated from Aspergillis has an adenine content of 25%. Based upon this information, what is the %G + %C within the Aspergillis DNA?

A) 0% B) 25% C) 50% D) 75% E) The answer cannot be determined from this information.

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Efferent arterioles enter the Bowman's capsule and afferent arterioles leave the Bowman's capsule.

a. true b. false

Biology & Microbiology