A nuclei acid whose molecular weight ranges between $40, 000$ to $1, 00, 000$ in a cell is

DNA

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mRNA

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tRNA

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rRNA

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Solution

The correct option is D rRNA
rRNA (ribosomal RNA) is synthesised in the nucleolus. This rRNA forms the major portion of the ribosome by weight. Its molecular weight ranges from 40,000- 1,00,000. This rRNA is involved in protein synthesis. Thus the correct answer is option D.

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