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 of the following microbes is made up of protein only?

Which of the following statements is false regarding viroids?

Give an example of a rod-shaped virus.

Which of the following is a sub-viral agent smaller than a virus?

The Tobacco Mosaic Virus $(TMV)$ is a tubular filament of size:

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