Question:

Which sugar is present in DNA?

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DNA contains deoxyribose; RNA contains ribose — remember the 'deoxy' refers to missing one oxygen atom.
  • Ribose
  • Arabinose
  • Deoxyribose
  • Glucose
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The Correct Option is C

Approach Solution - 1

DNA (Deoxyribonucleic acid) contains deoxyribose as its sugar component. It differs from ribose (found in RNA) by lacking one oxygen atom.
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Approach Solution -2

Elimination approach: Ribose is the five-carbon sugar found in RNA, not DNA. Arabinose is a plant-derived sugar used in some polysaccharides, unrelated to nucleic acid backbones. Glucose is a six-carbon sugar used mainly for energy metabolism, not for building nucleotides.
DNA's backbone sugar is a five-carbon sugar that is missing a hydroxyl group at the 2' carbon compared to ribose, which is exactly why it is named deoxyribose ("deoxy" = without one oxygen). This structural difference from ribose is also what gives DNA greater chemical stability than RNA.
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