Which part of a nucleotide is the sugar component?

Which part of a nucleotide is the sugar component?

• A. Phosphate group
• B. Nitrogen base
• C. 5-carbon sugar
• D. Hydrogen bond

Answer: (C)

The five-carbon sugar is the component that defines the sugar part of a nucleotide. In DNA this sugar is deoxyribose, and in RNA it is ribose. This sugar serves as the central scaffold: it bonds to one phosphate group to form the backbone and to a nitrogenous base to complete the nucleotide. The phosphate group is the other piece that links nucleotides together through phosphodiester bonds, building the polymer chain. The nitrogenous base holds the informational content of the nucleotide and, when DNA is double-stranded, pairs with a complementary base via hydrogen bonds. Hydrogen bonds are interactions between bases in the double helix, not part of the covalent structure of the nucleotide itself.

The five-carbon sugar is the component that defines the sugar part of a nucleotide. In DNA this sugar is deoxyribose, and in RNA it is ribose. This sugar serves as the central scaffold: it bonds to one phosphate group to form the backbone and to a nitrogenous base to complete the nucleotide. The phosphate group is the other piece that links nucleotides together through phosphodiester bonds, building the polymer chain. The nitrogenous base holds the informational content of the nucleotide and, when DNA is double-stranded, pairs with a complementary base via hydrogen bonds. Hydrogen bonds are interactions between bases in the double helix, not part of the covalent structure of the nucleotide itself.