Which of the following statements is incorrect?

  • A
    Viroids lack a protein coat.
  • B
    Viruses are obligate parasites.
  • C
    Infective constituent in viruses is the protein coat.
  • D
    Prions consist of abnormally folded proteins.

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The polio virus is a ........

The symbiotic association between algae and fungi is known as -

Assertion $A$: Viruses are considered as a link between living and non-living organisms.
Reason $R$: Viruses are non-living,but they are obligate parasites in living cells.
Which option is correct for Assertion $A$ and Reason $R$?

Who discovered viroids?

Which virus is shown in the given figure?

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