NEET 2008 Biology question

In the DNA molecules

(1)There are two strands which run antiparallel - one in direction and other in Correct
(2)The total amount of purine nucleotides and pyrimidine nucleotides is not always equal
(3)There are two strands which run parallel in the direction
(4)The proportion of Adenine in relation to thymine varies with the organism

Answer: (1)

Solution

In the Watson-Crick model the two polynucleotide chains of DNA are antiparallel: one runs and the other . Hence option (1). By Chargaff's rules A = T and G = C, so the total purines

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Question ID VK-090057