NCERT Class XII Chemistry
Chapter - Biomolecules
Questions with Solutions

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Question : 23
Total: 33
The two strands in DNA are not identical but are complementary. Explain.
Solution:  
Two nucleic acid chains are wound about each other and held together by hydrogen bonds between pairs of bases. The two strands are complementary to each other because the hydrogen bonds are formed between specific pairs of bases. Adenine forms hydrogen bonds with thymine whereas cytosine forms hydrogen bonds with guanine.
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