Which of the following defines ecological resistance?
a. the ability of an ecosystem to remain at equilibrium despite disturbances
b. the ability of a species or group of species to synthesize food molecules
c. the speed at which an ecosystem recovers equilibrium after being disturbed
d. the actions required for the species in a system to remain the same
a. the ability of an ecosystem to remain at equilibrium despite disturbances
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If the side chains of amino acids contain the ammonium ion, they readily form ions that
A. are described as acidic amino acids. B. give positive electric charges to the amino acid. C. are described as basic amino acids. D. react with lipids to form lipoproteins. E. give positive electric charges to the amino acid AND are described as basic amino acids.
All cells have:
a. a nucleus, but not necessarily DNA b. a plasma membrane, but not necessarily DNA c. cytoplasm, but not necessarily a plasma membrane d. cytoplasm and a plasma membrane, but not necessarily DNA e. cytoplasm, a plasma membrane, and DNA
What do the roots emerging from germinating seeds exhibit?
A) positive gravitropism B) negative gravitropism C) positive phototropism D) negative phototropism
Biologists are studying two species whose DNA is known to differ by 10%. Which information would be least important in calibrating a molecular clock to determine how rapidly evolution has proceeded with these two species?
A) the fossil record of these two species B) a geological event that separated the species at a particular time C) the function of each of these regions of DNA D) the time of divergence of closely related species