Correct order of molecular weight is

DNA < rRNA < tRNA

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DNA < mRNA < rRNA

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tRNA < mRNA < DNA

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tRNA < DNA < mRNA

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Solution

The correct option is D tRNA < mRNA < DNA
Molecular weight is the mass of a molecule. It is calculated as the sum of the mass of each constituent atom multiplied by the number of atoms of that element in the molecular formula. So, the molecular weight of DNA is the highest while that of tRNA is the least.
So, the correct answer is option C.

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