In most species, all mRNA transcripts begin
with
a. methionine.
b. a ribosome.
c. AUG.
d. the P site.
e. an anticodon
C
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Which of the following comparisons between gap junctions and plasmodesmata is NOT true?
A. Both allow exchange of material between cells, but gap junctions allow larger-sized molecules to transfer between cells. B. Animal cells have gap junctions, and plant cells have plasmodesmata. C. In plasmodesmata, the plasma membranes of the connected cells are continuous, while in gap junctions, the plasma membranes of the connected cells remain distinct. D. Gap junctions connect cells directly at the plasma membranes, but plasmodesmata must also bridge the cell wall separating the two cells. E. All of the above statements are true.
The original source of genetic variation that serves as the raw material for evolution is ________.
A. mutation B. gene flow C. geographic isolation D. random fertilization
In the Lotka-Volterra model of predator-prey interactions, population growth is regulated through
A) reproduction for both predator and prey. B) reproduction for the predator and mortality for the prey. C) reproduction for the prey and mortality for the predator. D) mortality for both predator and prey.
Individual species will continually evolve as a result of:
a. coevolution. b. convergent evolution. c. punctuated equilibrium. d. natural selection. e. gradualism.