A dikaryotic cell:
A. has only one haploid nucleus
B. has only one diploid nucleus
C. has two diploid nuclei
D. has two haploid nuclei
E. has one haploid nucleus and one diploid nucleus
D. has two haploid nuclei
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As a result of an increase in phloem solute concentration near a source area, the fluid in the sieve element becomes ____
a. hypotonic b. hypertonic c. low turgor d. low-sugar e. dilute
What happens to air as it is warmed?
a. It rises. b. It sinks. c. It moves at a slower speed. d. It moves horizontally. e. It does none of these
An elk herd is observed over many generations. Most of the full-grown bull elk have antlers of nearly the same size, although a few have antlers that are significantly larger or smaller than this average size. The average antler size remains constant
over the generations. Which of the following effects probably accounts for this situation? A) directional selection B) stabilizing selection C) a bottleneck effect that resulted in low genetic diversity D) a high rate of gene flow
The shape of a protein is determined by the order of amino acids, if you change that order the protein can still function properly even though the shape has changed.
a. true b. false