The presence of ------------is the characteristic features of Retroviruses

Options :
  1. DNA polymerase
  2. RNA polymerase
  3. Reverse transcriptase
  4. all the above
Answer and Explanation :-

Answer: Option 4

Explanation:

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INTEREST. Here is the key to the whole thing. If and when you are truly interested in what you are doing, or are about to do, then you will center your attention on it with little or no effort, and almost irrespective of the attendant conditions.
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