Which of the following is correct about viroids?

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They have free RNA without protein coat.

They have free DNA without protein coat.

They have RNA with protein coat.

They have DNA with protein coat.

answer is B.

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Detailed Solution

(1)Viroids are sub-cellular organisms that have only single stranded circular RNA without protein coat. They are parasitic on plants. They were discovered by Raymer and Diener. These are smaller than prions and viruses.
(2) Some viruses like bacteriophages have DNA and are surrounded by protein coat.
(3) There is no organism with only DNA and lacking protein coat.
(4) Some viruses like TMV have RNA enclosed by protein coat (capsid).

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