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nmdcat.online June 27, 2026

The important difference between RNA and DNA at the level of the pentose sugar is the presence of a

A. Hydrogen atom at the 2' carbon in RNA
B. Hydroxyl group at the 2' carbon in RNA
✓
C. Oxygen atom missing from the 5' carbon in DNA
D. Methyl group added to the 1' carbon in RNA

📝 Explanation

The sugar in RNA is ribose, which has a hydroxyl (-OH) group on the 2' carbon. The sugar in DNA is deoxyribose, which has only a hydrogen atom at the 2' carbon. This single oxygen difference makes RNA chemically more reactive and less stable than DNA.

📖 Additional Information

  • Hydrogen atom at the 2' carbon in RNA
  • Hydroxyl group at the 2' carbon in RNA
  • Oxygen atom missing from the 5' carbon in DNA
  • Methyl group added to the 1' carbon in RNA

The sugar in RNA is ribose, which has a hydroxyl (-OH) group on the 2' carbon. The sugar in DNA is deoxyribose, which has only a hydrogen atom at the 2' carbon. This single oxygen difference makes RNA chemically more reactive and less stable than DNA.

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