What are the three components of a nucleotide?

What are the three components of a nucleotide?

• A. Phosphate group, a five-carbon sugar, and a nitrogenous base.
• B. A fatty acid, glycerol, and a phosphate group.
• C. A sugar, a lipid, and a protein.
• D. An amino acid, a sugar, and a phosphate.

Answer: (A)

A nucleotide consists of a phosphate group, a five-carbon sugar, and a nitrogenous base. The sugar (ribose in RNA or deoxyribose in DNA) forms the backbone of nucleic acids when linked by phosphate groups, creating the sugar–phosphate chain through phosphodiester bonds. The nitrogenous base provides the information-carrying component, pairing with a complementary base during processes like replication and transcription. The other options describe components of lipids or proteins rather than a nucleotide, so they don’t fit the structure of a nucleotide.

A nucleotide consists of a phosphate group, a five-carbon sugar, and a nitrogenous base. The sugar (ribose in RNA or deoxyribose in DNA) forms the backbone of nucleic acids when linked by phosphate groups, creating the sugar–phosphate chain through phosphodiester bonds. The nitrogenous base provides the information-carrying component, pairing with a complementary base during processes like replication and transcription. The other options describe components of lipids or proteins rather than a nucleotide, so they don’t fit the structure of a nucleotide.