How would the loss of p53 activity affect a cell?
A. The G1/S checkpoint would be
unregulated.
B. DNA damage could accumulate.
C. CDK activity would be unregulated.
D. All of the above are correct.
D
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Cuvier, an anatomist and paleontologist, proposed that ____
a. all present-day organisms have descended, with adaptations, from one--or possibly a few--original organisms b. Earth's history has been marked by several periods when destruction of populations was widespread and that, after each such period, the earth was repopulated c. evolutionary changes in organisms are caused by use and disuse d. although evolution is responsible for all the changes that happen to species, one center of creation resulted in the original members of each species e. geologic processes in Earth have not changed over billions of years
Spider crabs are an osmoconforming species, which likely means:
A. they regulate their solute concentration within their environment. B. they have the same solute concentration as their environment. C. they have the same temperature as their environment. D. they regulate their temperature within their environment.
The tendency of certain forest species to occur in certain habitats (ridge tops or moist river bottoms, for example) is convincing evidence for the closed community concept.
a. true b. false
Accessory pigments within chloroplasts are responsible for
a. driving the splitting of water molecules b. absorbing photons of different wavelengths of light c. providing electrons to the reaction center chlorophyll after electrons pass to NADP+ d. pumping H+create a proton gradient across the thylakoid membrane e. anchoring chlorophyll a within the reaction center