Mad cow disease in cattle and $Creutzfeldt-Jakob$ disease in humans are due to infection by

  • A
    Bacterium
  • B
    Virus
  • C
    Viroid
  • D
    Prion

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Which nucleic acid is present in the structure of a viroid in a stranded form?

Which of the following shows a coiled $RNA$ strand and capsomeres?

Identify the organism shown in the given figure.

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