Which of the following is an important 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 ultramicroscopic in size.
  • D
    They are carriers of infectious diseases.

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Which of the following microbes is made up of protein only?

The structure present in nature which exhibits characteristics of both living and non-living organisms is:

Which of the following structures contains a short strand of $RNA$?

$DNA$ is absent in:

Which of the following viruses has a tadpole-like shape?

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