A transposon is
A) a DNA segment that can insert itself at one or more sites in a genome.
B) a "jumping gene."
C) a DNA segment that may cause mutations in genes or chromosomal rearrangements.
D) a mobile genetic element that may or may not leave a copy of itself in its original site when it moves to a new site.
E) All of these
E
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The efficient exchange of gases in gills is an example of countercurrent exchange
____________________ Indicate whether the statement is true or false.
Pigments that absorb light energy to drive photosynthesis include
A) chlorophyll only. B) chlorophyll and carotenoids. C) carotenoids and anthocyanins. D) carotenoids only. E) anthocyanins only.
Refer to the figure above. Which curve best describes survivorship in humans who live in developed nations?
A) A B) B C) C D) D E) E
Filopodia that are supported by microtubules are known as
A. reticulopodia. B. tubulopodia. C. micropodia. D. lophopodia. E. axopodia.