Question

Draw a schematic diagram of a part of double stranded dinucleotide DNA chain having all the four nitrogenous bases and showing the correct polarity.

Answer 1

hope this answer will be helpful

Answer 2

The structure of double stranded DNA:

Explanation:

• A double stranded DNA is comprised of two DNA strands coiled in the form of a helix.
• The orientation of each strand is opposite, one is directed from 5'→3' direction and the other from 3'→5' direction.
• Each strand of the helix is made up of alternately arranged:

1. Phosphate group linked with the help of phosphodiester bond to
2. Deoxyribose sugar.

• The inner part of the helix is composed of nitrogenous bases, purines (adenine and guanine) and pyrimidines (cytosine and thymine) linked to the deoxyribose sugar by ester bond.
• Here the purine is capable of forming hydrogen bonds with the pyrimidines.
• Adenine(A) is capable of forming two hydrogen bonds with Thymine(T).
• Guanine(G) is capable of forming three hydrogen bonds with Cytosine(C).