BIOMOLECULES AND ENZYMES

Detailed explanation-1: -DNA consists of two strands that wind around each other like a twisted ladder. Each strand has a backbone made of alternating sugar (deoxyribose) and phosphate groups. Attached to each sugar is one of four bases–adenine (A), cytosine (C), guanine (G), or thymine (T).

Detailed explanation-2: -A sugar-phosphate backbone (alternating grey-dark grey) joins together nucleotides in a DNA sequence. The sugar-phosphate backbone forms the structural framework of nucleic acids, including DNA and RNA. This backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.

Detailed explanation-3: -Recall that a nucleotide contains a phosphate group, a pentose sugar, and a nitrogenous base. The biggest difference between an RNA nucleotide and a DNA nucleotide is the type of pentose sugar. DNA, or deoxyribonucleic acid, contains deoxyribose sugar whereas RNA, or ribonucleic acid, contains ribose sugar.

Detailed explanation-4: -The backbone of the DNA is composed of deoxyribose sugar and a phosphate molecule.