Which of the following is the most correct description of the function of reverse transcriptase?
A) It synthesizes a DNA strand from an RNA template, degrades the RNA strand, and replaces the RNA with a new DNA strand.
B) It synthesizes an RNA strand from an integrated DNA, then synthesizes the complementary strand to produce a double-stranded RNA.
C) It synthesizes a DNA from an integrated DNA template, then synthesizes multiple RNA copies of the newly synthesized DNA molecule.
D) It synthesizes an RNA strand from an infecting single-strand RNA then synthesizes multiple RNA copies of both strands.
E) It synthesizes a DNA strand from an infecting RNA strand, then uses the DNA as a template for synthesis of multiple new RNA strands.
A
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What is the main function of the nucleus?
A) To hold all of the DNA B) To hold all of the RNA C) To produce proteins D) To produce energy
Which of the following is NOT a unique characteristic of chordates at some time in their life history?
Select one: a. a dorsal notochord b. a ventral hollow nerve cord c. pharyngeal pouches d. gill clefts e. a postanal tail
If a tree's heartwood rots out, the tree will
A) not survive because the active xylem is destroyed. B) not survive because the active phloem is destroyed. C) replace the heartwood with sapwood to compensate for the damaged tissue. D) be weaker than normal and more likely to blow over in a storm.
Escherichia coli ____
a. has only recently been employed in scientific research b. can undergo natural transformation c. is a disease caused by prions d. replicates slowly e. can be infected by bacteriophages