5.Illustrate the condensation reaction that is responsible for the backbone structure of nucleic acids.

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 5.Illustrate the condensation reaction that is responsible for the backbone structure of nucleic acids.

answer:

condensation reaction means the removal of water molecules and form the bond.

Hint:-Deoxyribonucleic acid is a double helix structure composed of two polynucleotide chains that coil around each other to form a genetic molecule carrying genetic instructions for the growth, development and reproduction of organisms. The two strands of DNA chain run in opposite directions to each other and are thus called antiparallel.

Complete Answer:-DNA is a heteropolymer of deoxyribonucleotides, which are made up of a pentose sugar, nitrogenous bases and a phosphate moiety. Each nucleotide is composed of one of the four nitrogen molecules containing nucleobases (cytosine, guanine, adenine or thymine), a deoxyribose sugar and a phosphate group.
Two successive nucleotides are joined by covalent bonds called phosphodiester bonds present between the sugar of one nucleotide and phosphate of the alternating sugar phosphate. Hydrogen bonds are formed between the nitrogen bases. According to the base pairing rule to make double-stranded DNA, adenine forms a base pair with thymine and cytosine forms a base pair with guanine.
The backbone of DNA is the portion which provides structural support to the two strands and is made up of alternating sugar and phosphate groups while nitrogenous bases face inside.

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