Question

Viruses and Viroids differ in structure and the diseases they cause. How?

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Answer 1

Viruses :

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They did not find a place in classification.

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Not truly living.

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non-cellular organisms which take over the machinery of host cell on entering

it and become living but as such they have inert crystalline structure appear

non-living. So, difficult to call them living or non-living.

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Virus means venom of poisonous fluid. Pastuer gave the term virus.

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D.J. Ivanowsky found out that certain microbes caused Tobacco Mosaic

Disease in tobacco plant.

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M.W. Beijerinek called fluid as ‘Contagium vivum fluidum’ as extracts of

infected plants of tobacco could cause infection in healthy plants.

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W.M. Stanely showed viruses could be crystallized to form crystatls of protein

which are inert outside their specific host.

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Viruses are obligate parasites.

Viroids :

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Infectious agent, free RNA (lack protein coat)

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RNA has low molecular weight.

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Causes potato spindle tuber disease.

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Discovered by T.O. Diener.

Hope it helps!!

Answer 2

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chemical composition of virus

1. nucleic acid :either RNA OR DNA

2 Protein coat :-it is known as capsid and made up of small sub units calked capsomeres .

VIROIDS
They contains only very low molecular wt. RNA (SS RNA) and not the protein coat.

disease cause by:-
VIRUS

CHICKENGUNIA
COMMON COLD
HEPATITIS
DANGUE
AIDS....etc

VIROIDS:-
IT CAuses potato spindle disease

HOPE IT WILL HELP YOU