DNA helicase

  1. joins nucleotides
  2. seals Okazaki fragments
  3. adds a primer
  4. breaks hydrogen bonds to unwind the helix
Answer

D) breaks hydrogen bonds to unwind the helix

Helicase unzips DNA. AS & A Level Biology · Topic 6 Nucleic Acids and Protein Synthesis · 6.1 Structure of nucleic acids and replication of DNA

Biology MCQ · More A Level Biology: Nucleic acids and protein synthesis MCQs · Practise