The pentose sugar in DNA is known as 2-deoxyribose.

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Study for the Biochemistry Module 6 Exam. Study with flashcards and multiple choice questions; each question includes hints and explanations. Gear up to ace your test!

Multiple Choice

The pentose sugar in DNA is known as 2-deoxyribose.

Explanation:
DNA uses a five-carbon sugar called 2'-deoxyribose, which means the 2' position lacks a hydroxyl group and carries just a hydrogen. This small change from ribose—the sugar in RNA that has an -OH at the 2' carbon—defines DNA's backbone chemistry and contributes to its greater chemical stability and ability to form a stable double helix. The other sugars listed are ribose (RNA’s sugar) and glucose/fructose (hexoses not used in nucleic acid backbones).

DNA uses a five-carbon sugar called 2'-deoxyribose, which means the 2' position lacks a hydroxyl group and carries just a hydrogen. This small change from ribose—the sugar in RNA that has an -OH at the 2' carbon—defines DNA's backbone chemistry and contributes to its greater chemical stability and ability to form a stable double helix. The other sugars listed are ribose (RNA’s sugar) and glucose/fructose (hexoses not used in nucleic acid backbones).

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