A tropical forest and desert are examples of
A. biospheres.
B. biomes.
C. populations.
D. ecosystems.
E. communities.
Answer: B
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In some cells, there are many ion electrochemical gradients across the plasma membrane even though there are usually only one or two proton pumps present in the membrane. The gradients of the other ions are most likely accounted for by _____
A) cotransport proteins B) ion channels C) pores in the plasma membrane D) passive diffusion across the plasma membrane E) cellular metabolic reactions that create or destroy ions
The tree line in alpine areas is often determined by a combination of
A. wind and water. B. water and soil type. C. salts in the soil. D. low temperatures and high winds. E. high temperatures and high winds.
Which energy source fuels cell division in animal cells?
a. GTP b. ATP c. kinetic energy of Golgi body movement d. glycerol e. fat deposits
The amount of air that enters and leaves the lungs with each breath is the ____
a. respiratory volume b. respiratory rate c. vital capacity d. tidal volume e. inspiratory volume