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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 bases of one strand of DNA are paired with bases of other strand through hydrogen bonding. The hydrogen bonding is very specific because structures of heterocycles allow only one mode of pairing. The two strands of DNA are complementary to each other because the sequence of bases in one strand automatically determines that of the other.
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MODERN PUBLICATION-BIOMOLECULES-NCERT FILE (NCERT)(Textbook Exercises)
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