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WAEC Biology 2018 Question 46

Question 46

Chromosomes, DNA and Sex Linkage

The chemical bond that holds the bases of the two strands of DNA together is

  1. A.oxygen bond.
  2. B.hydrogen bond.
  3. C.electrovalent bond.
  4. D.covalent bond.
Show the answer and explanation

Answer: B (hydrogen bond.)

Explanation

The two strands of DNA are joined by weak hydrogen bonds between paired bases (A with T, G with C). This lets the strands separate when DNA is copied.