In a double stranded DNA, the two strands are held together by ________.

  1. hydrogen bonds
  2. phosphodiester bonds
  3. covalent bonds
  4. ionic bonds

Answer (Detailed Solution Below)

Option 1 : hydrogen bonds
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  • The two strands of the DNA are held together by hydrogen bonds formed between the complementary nitrogenous bases (adenine, guanine, cytosine, and thymine) of the two strands.
  • Adenine and thymine are held by 2 hydrogen bonds whereas cytosine and guanine are held by 3 hydrogen bonds.
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