A) DNA polymerase
B) RNA polymerase
C) Reverse transcriptase
D) All of the above
Correct Answer: A
Solution :
The DNA polymerase enzyme catalyses polymerisation only in one direction, i.e., \[5\to 3\], during polynucleotide synthesis. In a transcription unit, RNA polymerase also catalyses the polymerisation in only one direction, i.e., \[5\to 3\]. Retroviruses are equipped with an enzyme called reverse transcriptase which transcribes an RNA template into DNA.
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