An activator is to an enhancer as a(n) _____ is to a silencer.
A. transcription factor
B. inducer
C. repressor
D. mediator
E. RNA polymerase II
C. repressor
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The saguaro cactus flowers in the
a. dry period, which is April–June. b. dry period, which is July–August. c. wet period, which is April–June. d. wet period, which is July–August.
In producing beer and wine, humans have exploited the microbial ability to ferment sugar to alcohol. The microbes responsible for this process are ________.
A. algae B. fungi C. protozoans D. bacteria
Refer to the accompanying figure. Asexual reproduction is occurring at which point?
a. 1 b. 3 c. 4 d. 7 e. 9
Which examples would be considered different species under the biological species concept? Check all that apply.
A. Two plant species with no gene flow between them. B. Two bear species are able to breed in zoos, but have separate ranges in nature. C. Two tree species have different leaf shapes, but form hybrids in their overlapping ranges. D. Two skunk species look morphologically similar, but are unable to interbreed. E. Two snake species look different, but often form fertile hybrids.