In the DNA molecule

In the DNA molecule

Options

(a) the total amount of purine nucleotides and pyrimidine nucleotides is not always equal
(b) there are two strands which run parallel in the 5′ → 3′ direction
(c) the proportion of Adenine in relation to thymine varies with the organism
(d) there are two strands which run antiprallel one in 5′ → 3′ direction and other in 3′ → 5′

Correct Answer:

there are two strands which run antiprallel one in 5′ → 3′ direction and other in 3′ → 5′

Explanation:

In the DNA molecule, there are two strands which run anti parallel one is 5′ – 3′ direction and other in 3′ – 5′ direction, the two chains are held together by hydrogen bonds between their bases.Adenine (A), a purine of one chain his exactly opposite thymine (T), a pyramidine of the other chain. Similarly, cytosine (C), a pyrimidine lies opposite guanine (G), a purine. This allows a sort of lock & key arrangement between large sized purine & small sized pyrimidine. It is strengthened by the appearance of hy

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