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
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An example of an enzyme with high activity in an acidic environment is _____
A) amylase B) pepsin C) gastrin D) trypsin E) sucrose
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.
Where do the light-dependent reactions take place?
a. stroma b. intermembrane space c. thylakoid membrane d. thylakoid lumen
Allopatric speciation is compatible with both the gradualistic and punctuated equilibrium models of evolution.
a. true b. false