This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Transcription, Subject name: Biochemistry
cDNA from RNA is synthesized by - 
Select and explain. 
A. Helicase, B. DNA dependent DNA polymeraze, C. Topoisomerase, D. Reverse transcriptase
D: Reverse transcriptase
Answer: D: Reverse transcriptase 
Explanation: Ans. is 'd' i.e., Reverse transcriptase o The enzyme RNA dependent DNA polymerase (reverse transcriptase) is responsible for the formation of DNA from RNA.o This DNA is complementory (c DNA) to viral RNA and can be transmitted into host DNA.