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NEETChemistryBiomolecules

Give the reason why the two strands in DNA are not identical but are complementary

Options

  1. AThe two strands in DNA are not identical because they are synthesized from different sets of genes.
  2. BThe two strands in DNA molecule are held together by hydrogen bonding, which is according to a specific rule(A
  3. CThe two strands in DNA are complementary because they have the same sequences of nucleotides.
  4. DThe two strands in DNA are not identical because they have different chemical structures.

Correct answer

B. The two strands in DNA molecule are held together by hydrogen bonding, which is according to a specific rule(A

Step-by-step solution

Correct Option is : (B) The two strands in DNA molecule are held together by hydrogen bonding, which is according to a specific rule(Adenine is bound thymine and guanine to cytosine).Due to this base pairing principle, the sequence of bases in one strand automatically fixes the sequence of bases in the other stand. Thus, the two strands are not identical but are complimentary.

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