Question

why RNA is single stranded and dna is double stranded?
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Answer 1

Explanation:

Unlike DNA, RNA in biological cells is predominantly a single-stranded molecule. ... While DNA contains deoxyribose, RNA contains ribose, characterised by the presence of the 2′-hydroxyl group on the pentose ring (Figure 5). This hydroxyl group make RNA less stable than DNA because it is more susceptible to hydrolysis.