Which of the following is the composition of a virus?

  • A
    Proteins and $DNA$ or $RNA$
  • B
    Proteins,$DNA$ and $RNA$
  • C
    Proteins,$DNA, RNA$ and lipids
  • D
    Carbohydrates,nucleic acids and lipids

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Lichens are indicators of $SO_2$ pollution because they are ........

Which of the following is an important characteristic of viruses?

Which of the following is a type of lichen?

Assertion $(A)$: Viroids lack the protective protein coat known as the capsid.
Reason $(R)$: Viroids contain a short strand of $DNA$.

$A$ $Zymophage$ is a parasite on which of the following?

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