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Question
The two strands of DNA are not identical but complementary. Explain.
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Solution
Dear student
In the helical structure of DNA, the two strands are held together by hydrogen bonds (hydrogen bonding) between specific pairs of bases.
Cytosine forms hydrogen bond with guanine, while adenine forms hydrogen bond with thymine. As a result, the two strands are complementary to each other.
If one of these bases is located on one chain of DNA, its complementary base is hydrogen bonded to it on the other chain. This means that Guanine base present on one chain of DNA is hydrogen bonded to its complementary base, Cytosine present on the other chain. Similarly, Adenine is hydrogen bonded to Thymine on the other hand.
Regards
In the helical structure of DNA, the two strands are held together by hydrogen bonds (hydrogen bonding) between specific pairs of bases.
Cytosine forms hydrogen bond with guanine, while adenine forms hydrogen bond with thymine. As a result, the two strands are complementary to each other.
If one of these bases is located on one chain of DNA, its complementary base is hydrogen bonded to it on the other chain. This means that Guanine base present on one chain of DNA is hydrogen bonded to its complementary base, Cytosine present on the other chain. Similarly, Adenine is hydrogen bonded to Thymine on the other hand.
Regards
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