Read the given statements that describe certain infectious particle.
(i) It was discovered by T.O. Diener and was found to be smaller than viruses.
(ii) It causes potato spindle tuber disease.
(iii) It is a free RNA particle which lacks the protein coat.
(iv) It has low molecular weight RNA as genetic material.
Which of the following is referred to here?

Virus

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Viroid

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Virion

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Bacteriophage

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Solution

The correct option is A Viroid
The Potato axle tuber viroid was the primary viroid to be distinguished. PSTVd is a little, round RNA atom firmly identified with the chrysanthemum stunt viroid. Present inside the viroidal RNA is the Pospiviroid RY theme stem circle. The common hosts are potatoes and tomatoes.
So, the correct option is 'Viroid'.

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Similar questions

T.O Diener (1971) discovered a new infectious agent that was smaller than viruses. It was

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

Which of the following statements are incorrect?

1) RNA acts as a genetic material as well as a catalyst.

2) RNA is more stable than DNA.

3) RNA has evolved from DNA

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