Which enzyme copies an mRNA sequence into DNA during cDNA library construction?
A) RNA polymerase
B) DNA polymerase
C) reverse transcriptase
D) restriction endonuclease
C) reverse transcriptase
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As a research scientist, you measure the amount of ATP and NADPH consumed by the Calvin cycle in 1 hour. You find that 30,000 molecules of ATP were consumed, but only 20,000 molecules of NADPH were consumed. Where did the extra ATP molecules come from?
A) photosystem II B) photosystem I C) cyclic electron flow D) linear electron flow E) chlorophyll
Which of the following is true of viruses in the extracellular phase?
A. They possess many different enzymes and they can reproduce independently of living cells but only at a slow rate. B. They possess many different enzymes. C. They can reproduce independently of living cells but only at a slow rate. D. They behave as a macromolecular complex and are no more alive than are ribosomes.
There are no trees in the tundra because:a
of the short growing season. b. of the limited supply of nutrients in the soil. c. of limited root penetration due to permafrost. d. of limited precipitation.
e. of low temperatures.If an animal ignores a stimulus that is continuously present, we say that the animal has
A. instinctively blocked out the stimulus. B. imprinted on a different stimulus. C. habituated to the stimulus. D. None of these answers is true.