In the DNA molecule                 [2008]

(a) The total amount of purine nucleotides and pyrimidine nucleotides is not always equal

(b) There are two strands which run parallel in 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' direction 

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