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Two strands in DNA are not identical but...

Two strands in DNA are not identical but are complementary. Explain?

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The two strands in DNA molecules are complementary to each other because hydrogen bonds are formed between purine base of one strand and pyrimidine base of the other and vice-versa. Because of sizes and geo,etries of the bases, the only possible pairing in DNA are between G (gaunine) and C (cylosine) through three H-bonds and between A (Adenosine) and T (Thymine) through two H bonds. Therefore, GC pair base has more stability as compared to AT base pair. Thus, the two strands are complementary and not identical.
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