Infectious proteins are

gemini viruses

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prions

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viroids

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satellite viruses

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Solution

The correct option is B prions
Prions have a distinct extracellular form but the extracellular form is entirely protein. The prion particle does not contain any nuclei acid. However, it is infectious and prions are known to cause a variety of diseases in animals

Suggest Corrections

A.	Viroids	Infectious free RNA	Potato spindle tuber disease
B.	Prions	Infectious proteins	Mad cow disease
C.	Viruses	Nucleo proteins	Mumps
D.	Lichens	Algae + Fungi	Indicators of CO pollution