Pick the wrong statement regarding DNA and RNA.
Question and options
Pick the wrong statement regarding DNA and RNA.
- DNA has higher molecular mass than RNA
- DNA being double helical is less stable than RNA
- Nucleotides in both RNA and DNA are joined together through phosphodiester linkages to form polynucleotides
- RNA has uracil as one among the bases whereas DNA has thymine as one among the bases
Answer and explanation
Correct answer: B - DNA being double helical is less stable than RNA
The statement 'DNA being double helical is less stable than RNA' is wrong: DNA is more stable than RNA because it lacks the 2'-OH group that makes RNA prone to hydrolysis and is stabilised by its double-stranded helix. The other three statements (higher molecular mass of DNA, phosphodiester linkages between nucleotides forming polynucleotides, and uracil in RNA versus thymine in DNA) are correct.
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