Savannas typically occur in
A) cold areas with little rainfall in polar regions.
B) cold areas with little rainfall at high altitudes in the tropics.
C) very dry areas in the rain shadow of mountains of both temperate and tropical latitudes.
D) warm areas with seasonal rainfall in the tropics.
D
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In bacteria, fungi, and plants the high internal pressure generated by osmosis is counteracted by the mechanical strength of their
A. plasma membranes. B. organelles. C. cytoskeletons. D. cell walls.
Legionella pneumophila
A. requires special lab growth media. B. always causes a severe pneumonia. C. often lives intracellularly in amoebas. D. causes fever, cough, and diarrhea.
A cell is expressing the mutant form of ras, but one of the downstream relay proteins is not present because of another mutation. How will cell division be affected in this scenario?
A) Cell division will decrease because the mutant form of ras decreases cell division. B) Cell division will increase because the mutant form of ras increases cell division. C) The cell will divide normally. D) The cell will not divide at all unless other proteins that stimulate cell division are present.
Disassembly of the nuclear envelope ________________
(a) causes the inner nuclear membrane to separate from the outer nuclear membrane. (b) results in the conversion of the nuclear envelope into protein-free membrane vesicles. (c) is triggered by the phosphorylation of integrins. (d) must occur for kinetochore microtubules to form in animal cells.