Multiple Choice
RNA differs from DNA in that RNA uses which nitrogenous base in place of thymine?
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7. DNA and Chromosome Structure
RNA
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In terms of chemical stability under alkaline conditions, why is DNA generally more stable than RNA?
A
DNA contains ribose while RNA contains deoxyribose, and ribose is less reactive than deoxyribose.
B
DNA uses uracil instead of thymine, and uracil makes the sugar-phosphate backbone more resistant to hydrolysis.
C
DNA is double-stranded whereas RNA is always single-stranded, and single-stranded nucleic acids cannot be chemically stable.
D
DNA lacks a ′ -hydroxyl group, so its backbone is less prone to base-catalyzed hydrolysis than RNA.
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