NEET Biology question

In the DNA molecule,

(A)The total amount of purine nucleotides and pyrimidine nucleotides is not always equal
(B)There are two strands that 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 antiparallel- one in 5'→3' direction and other in 3'→5'Correct

Answer: (D)

Solution

In double-stranded DNA, the two polynucleotide strands are antiparallel, one running 5'→3' and the other 3'→5'. Purines always equal pyrimidines (A=T, G=C) and

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Question ID VK-111568