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In the DNA molecule

1. the total amount of purine nucleotides and pyrimidine nucleotides is not always equal
2. there are two strands which run parallel in the 5’ → 3’ direction
3. the proportion of Adenine in relation to thymine varies with the organism
4. there are two strands which run anti parallel one in 5’ → 3’ direction and other in 3’ → 5’

Correct answer: there are two strands which run anti parallel one in 5’ → 3’ direction and other in 3’ → 5’

Solution

DNA is a double helix made of two complementary strands that align in opposite directions, called antiparallel. This arrangement is essential for correct base pairing and replication.

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