Carrier-mediated transport is also called
A. facilitated diffusion.
B. active transport.
C. exocytosis.
D. endocytosis.
E. phagocytosis.
A
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Sodium has one valence electron in its third energy level. To reach a stable energy configuration,
sodium will tend to
a. take up an electron from another atom. b. move its valence electron to the second energy shell. c. give up an electron to another atom. d. share its valence electron with another atom. e. move an electron from the second energy level to the valence shell.
The sum total of all the microbes in a certain environment is termed the ________.
A. phylogeny B. microbial niche C. domain D. microbiome E. biofilm
A survivorship curve similar in shape to that seen in humans might be expected to be seen in
a. elephants. b. domestic cows. c. whales. d. a rhinoceros. e. any of the above.
The original atmosphere of Earth is thought to have been rich in
a. CO2, N2, H2, H2S, and CO. b. CO2, N2, O2, Ar, and Ne. c. CO2, N2, O2, Rn, and Ne. d. CO2, N2, H2, Kr, and Xe.