The following pentose sugar is obtained by complete hydrolysis of DNA, along with phosphoric acid and nitrogeneous base:

The pentose sugar obtained by complete hydrolysis of DNA is deoxyribose.

DNA is a nucleic acid, and nucleic acids are made up of monomers called nucleotides. Nucleotides are composed of three parts: a nitrogenous base, a pentose sugar, and a phosphate group.

The nitrogenous bases in DNA are adenine (A), guanine (G), cytosine (C), and thymine (T). The pentose sugar in DNA is deoxyribose.

When DNA is completely hydrolyzed, the nucleotides are broken down into their individual components: nitrogenous bases, pentose sugar, and phosphate groups. The pentose sugar obtained from DNA hydrolysis is deoxyribose.

Deoxyribose is a five-carbon sugar with a hydroxyl group removed from the second carbon atom. This gives deoxyribose its characteristic name.

Deoxyribose is an important component of DNA because it contributes to the double helix structure of DNA. The deoxyribose sugars in the two strands of DNA are joined together by phosphate groups to form a backbone. The nitrogenous bases are attached to the deoxyribose sugars by glycosidic bonds.

The double helix structure of DNA is essential for its function as the genetic material of all living organisms. DNA stores and transmits genetic information, which is used to produce proteins and other molecules that are essential for life.