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The latest view for the origin of viruses
  1. these are modified plasmids, which are infact fragments of the nucleic acids of the lost.
  2. those arose from some bacteria, which had developed a nucleus only
  3. these have arisen from nucleic acid and protein, found in primitive soup.
  4. those arose from bacteria as a result of the loss of cell wall, ribosome, etc.


Solution

The correct option is A these are modified plasmids, which are infact fragments of the nucleic acids of the lost.
Many scientists believed that viruses are modified plasmids, which are the fragments of nucleic acids of host. These genome fractions escaped and got induced into host cells.

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