Chromatin condenses into chromosomes and the mitotic spindle begins to form during
a. interphase.
b. prophase.
c. metaphase.
d. anaphase.
e. telophase.
B
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Cotton-topped tamarins are small primates with tufts of long white hair on their heads. While studying these creatures, you notice that males with longer hair get more opportunities to mate and father more offspring. To test the hypothesis that having longer hair is adaptive in these males, you should _____.
A) test whether other traits in these males are also adaptive B) look for evidence of hair in ancestors of tamarins C) determine if hair length is heritable D) test whether males with shaved heads are still able to mate
Plants have been shown to elicit defense responses upon recognition of part of the bacterial flagella, a structure important for bacterial locomotion. The flagella is likely to be sensed by
A. hormones. B. the product of a resistance gene. C. the product of an avirulence gene. D. elicitors.
If a cell has 20 chromosomes in it, how many are there after replication occurs?
a. 30 b. 40 c. 50 d. 60
Carotid bodies and aortic bodies detect
A. the stretching of the lungs. B. tissue oxygen levels. C. blood oxygen levels. D. blood pH. E. the residual volume.