In the DNA molecule

Options

A. The proportion of Adenine in relation to thymine varies with the organism
B. There are two strands which run antiparallel-one in 5'`to`3' direction and other in 3' `to` 5'
C. The total amount of purine nucleotides and pyrimidine nucleotides is not always equal
D. There are two strands which run parallel in the 5' `to` 3' direction

Answer

B

Explanation

Structure of DNA
DNA consists of two strands that are wrapped around one another to form double helix.
It has antiparallel direction one in 5’ – 3’ direction and other in 3’ – 5’ direction.
It forms complementary base pairing with purine and pyrimidine (A = T and G = C)
The amount of purine and pyrimidine remain same having base puring. (A = T) (G = C)
Total amount of purine is not equal to total amount of pyrimidine A + G `ne` T + C