In the figure above, representing transcription, the item labeled "A" is

a. reverse transcriptase.
b. primase.
c. the spliceosome.
d. RNA polymerase.
e. DNA helicase.


D

Biology & Microbiology

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An example of an enzyme with high activity in an acidic environment is _____

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All of the following statements about ferns are correct except 

A. ferns flourish in many habitats, but the majority are located in the tropics. B. the sporophyte is a conspicuous generation. C. the gametophyte is a conspicuous generation. D. ferns have underground stems called rhizomes. E. sori are located on the back or ventral surface of fronds.

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Where do the light-dependent reactions take place?

a. stroma b. intermembrane space c. thylakoid membrane d. thylakoid lumen

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Allopatric speciation is compatible with both the gradualistic and punctuated equilibrium models of evolution.

a. true b. false

Biology & Microbiology