Which of the following is an example of a density-independent regulation?
a. parasites
b. waste accumulation
c. hurricanes
d. predation
c. hurricanes
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The "central dogma" of retroviruses is most accurately described as
A) DNA ? protein. B) RNA ? protein. C) DNA ? RNA ? protein. D) protein ? RNA ? DNA ? protein. E) RNA ? DNA ? RNA ? protein.
Proteins called transcription factors are involved in ____ of transcription
a. both initiation and termination stages b. both initiation and elongation stages c. the termination stage d. the initiation stage e. the initiation, elongation, and termination stages
At a source the phloem typically has a water potential that is ____ that in surrounding xylem
a. lower than b. about the same as c. higher than d. exactly the same as e. less negative than
Mosses are limited to moist environments because they
A. have large roots. B. have sperm that swim. C. do not have leaves. D. produce eggs.