Infectious proteins are present in

  • A
    gemini viruses
  • B
    prions
  • C
    viroids
  • D
    satellite viruses

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The term "virion" is used for

The protective coat of structural protein in a virus is made up of units called:

$A$ : Viroids are not included in the five-kingdom system.
$R$ : They are non-cellular.

Which scientist demonstrated that the extract of infected tobacco plants could cause infection in healthy plants?

Potato spindle tuber disease is caused by

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