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The chemical difference between DNA and RNA includes:
AThey are chemically identical
BRNA contains thymine, DNA contains uracil
CRNA has deoxyribose; DNA has ribose
DRNA has uracil at the place of thymine; RNA's sugar has a 2′-OH group (DNA's deoxyribose lacks it)
Answer & Solution
Correct answer: D. RNA has uracil at the place of thymine; RNA's sugar has a 2′-OH group (DNA's deoxyribose lacks it)
Two key differences: (a) **sugar — RNA = ribose with 2′-OH; DNA = deoxyribose, no 2′-OH**; (b) **base — RNA has uracil, DNA has thymine (5-methyluracil)**. The 2′-OH makes RNA chemically more reactive/labile.
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