MCAT Biology Question — Viruses
- Apr 25, 2018
- MCAT Question of the Day
A. DNA polymerase
C. Reverse transcriptase
D. None of the above; HIV can utilize its host cell for all of the proteins or enzymes it needs.
Click for Explanation
A. DNA polymerase, incorrect, DNA polymerase is the enzyme that builds the new DNA strand during replication in the nucleus. HIV does not have any particular need for DNA polymerase, and in any case, the host cell contains this enzyme.
B. helicase, incorrect, helicase is the enzyme that unwinds the DNA double helix for replication. This choice is incorrect for a similar reason as choice A.
C. reverse transcriptase, correct.
D. incorrect. While this choice is tempting, note that HIV infects human cells. Human cells typically do not create DNA from RNA, so they would not be expected to contain reverse transcriptase. This enzyme, then, must be provided by HIV itself.
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