Question

Sketch and label only : A double helical DNA molecule.

Answer 1

Hope this may help u

Answer 2

Explanation:

DNA - deoxyribonucleic acid

first of all we should know about the DNA

it is the genetic material of an organism and it is found in every cell of an organism.

the structure of DNA is double helix.

this phenomena is given by Watson and Crick.

there are two strands in a DNA.

1. the first one is 5'
2. the second one is 3'

deoxyribonucleic acid or DNA have 4 nitrogenous bases

1. Adinine
2. Guanine
3. Cytocine
4. Thymine