Which of the following is a significant characteristic of viruses?

  • A
    They are active and alive only inside a host cell.
  • B
    They contain only one type of nucleic acid (either $DNA$ or $RNA$).
  • C
    They are extremely small in size.
  • D
    They are vectors of infectious diseases.

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Which of the following viruses contains $RNA$ as its genetic material?

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........ is a living chemical.

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