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Why two strands of DNA are not identical but are complimentary to each other?

Why two strands of DNA are not identical but are complimentary to each other?

Grade:9

1 Answers

Aarti Gupta
askIITians Faculty 300 Points
7 years ago
DNA consists of two strands of polynucleotides coiled around each other in the form of a double helix.The base of one strand of DNA are paired with bases on other strand by means of hydrogen bonding.This hydrogen bonding is very specific as the structures of bases permit only one mode of pairing.Adenine pair with only thymine via 2 hydogen bonds and guanine pairs with cytosine through 3 hydrogen bonds.The two strands of DNA are complementary to each other in the sense that the sequence of bases in one strand automatically determines that of the other.This specific base pairing is the most important principle of the structure od DNA.

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