Regarding the efficient initiation of transcription by RNA polymerase II, which specific "upstream" signals appear to be involved?
What will be an ideal response?
TATA and CAAT base sequences and enhancers
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Which one of the following most accurately describes the ratio of oxygen to carbon to hydrogen in a simple sugar such as glucose?
A. 1 : 2 : 1 B. 1 : 1 : 2 C. 2 : 1 : 1 D. 1 : 2 : 3 E. 1 : 3 : 2
The yolk sac is indicated by
a. A. b. B. c. C. d. D. e. E.
Most predators are also ________ to other predatory species
Fill in the blank(s) with correct word
Why do islands often make good "laboratories" for studying the mechanisms of extinction?
a. Island species tend to be especially resilient to extinction. b. Islands tend to harbor endemic species. c. Island populations of a species are good representatives of the same species' continental popu-lations. d. Biological communities of islands are less complex than the biological communities of conti-nents. e. B and D,