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Potato spindl...

Question

Potato spindle tuber disease is caused by an organism which has:

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Solution

Potato spindle tuber disease is caused by an infectious agent called viroid. Viroids comprise free RNA of low molecular weight. They lack a protein coat that is found in viruses . Viruses are crystalline structures as they have a nucleic acid enclosed with a protein coat. Abnormally folded proteins are prions.

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Q. Potato spindle tuber disease causing organism is different from HIV as the former

What is the name of the casual organism of potato spindle tuber disease?

Q. How many diseases given here are caused by prions?
Bovine spongiform encephalopathy (BSE), Creutzfeldt Jakob Disease (CJD), Potato spindle tuber disease, Common cold, Rabies

Q. Assertion :Yeasts are unicellular fungi that are used in bakery and brewery industries. Reason: Potato spindle tuber disease is caused by viroids.

Q. Read the following statements and select the option which identify the incorrect ones:
(i) Potato spindle tuber disease and Chrysanthemum stunt disease are caused by viroids.
(ii)

T_{4}

bacteriophage exhibits lytic cycle.
(iii) Retroviruses have two copies of ssRNA.
(iv) Interferon which prevent viral multiplication are glycolipid particles.

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