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  • Structure of DNA
  • How are base pairs of nucleotides held together?
Multiple choice

How are base pairs of nucleotides held together?

  1. sugar phosphate backbone

  2. hydrogen bonds

  3. their complementary pairing

  4. ionic bonds

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The two strands of the DNA double helix are held together by hydrogen bonds between the complementary nitrogenous bases.

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