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Question

Tobacco mosaic virus has

A
a single-stranded DNA molecule
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B
a double-stranded RNA molecule
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C
a single-stranded RNA molecule
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D
a double-stranded DNA molecule
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Solution

The correct option is C a single-stranded RNA molecule
Tobacco Mosaic Virus was the first virus which was discovered in 1892 by D.J. Ivanowski. The virus causes tobacco mosaic disease in tobacco plants. The tobacco mosaic virus, like any other virus, shows two constituents, a protein coat called the capsid and the nucleic acid. The nucleic acid in this virus is a single-stranded RNA.

Some symptoms of this disease include downward curling and distortion of apical leaves. The leaves show marks and spots on their surface in a mosaic pattern and the plant growth is stunted.

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