NEET Botany Biological Classification Questions Solved

NEET - 2010

Infectious proteins are present in

(1) gemini viruses

(2) prions

(3) viroids

(4) satellite viruses

Audio Explanation:


(2) Prions have a distinct extracellular form but the extracellular form is entirely protein. The prion particle does not contain any nucleic acid. However, it is infectious and prions are known to cause a variety of diseases in animals such as scrapie in sheep, bovine spongiform encephalopathy in cattle (BSE of mad cow disease), chronic wasting disease in deer and elk and Kuru and a form of Creutzfeldt-Jakob disease (CJD) in humans. No prion diseases of plants are known.

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