Bacterial genetic diversity can arise from:
A. sexual reproduction.
B. transduction and conjugation.
C. meiotic recombination.
D. meiotic recombination and conjugation.
E. horizontal gene transfer and sexual
reproduction.
B
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In which one of the following would one expect to find motor units made up of only a few muscle cells?
A) arm muscles B) eye muscles C) chest muscles D) thigh muscles E) lower-leg muscles
Which biome has the fewest types of species?
a. tundra b. taiga c. grassland d. desert e. It is not possible to determine this based on the information provided.
Stratospheric ozone is important because it:
a. traps reradiated heat from Earth. b. prevents heat penetration from the sun. c. replenishes the surface ozone layer. d. dissipates the surface ozone layer. e. blocks solar UV radiation.
Graft rejection can be reduced by
A) preventing B cell activation. B) antiphagocytic factors. C) antihistimines. D) preventing T cell proliferation. E) epinephrine.