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Molecular Biology

DNA Replication: Mechanisms and Enzymes Practice Questions

20 free DNA Replication: Mechanisms and Enzymes practice questions for the Zoology, each with the correct answer and a detailed explanation. Open any question below, or take the full set as an interactive quiz.

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All DNA Replication: Mechanisms and Enzymes questions

20 questions
  1. Q1. Which enzyme is responsible for unwinding the DNA double helix at the replication fork by breaking hydrogen bonds between nitrogenous bases?
  2. Q2. During DNA replication, the 'Leading Strand' is synthesized in which manner?
  3. Q3. What is the function of Single-Strand Binding Proteins (SSBs) during the replication process?
  4. Q4. Which enzyme relieves the torsional strain and supercoiling created ahead of the replication fork?
  5. Q5. DNA Polymerase III requires a free 3'-OH group to begin synthesis. Which enzyme provides this by creating a short RNA sequence?
  6. Q6. The discontinuous segments of DNA synthesized on the lagging strand are known as:
  7. Q7. In prokaryotes, which enzyme removes the RNA primers and replaces them with DNA nucleotides?
  8. Q8. Which enzyme acts as the 'glue' to join the sugar-phosphate backbones of DNA fragments, such as Okazaki fragments?
  9. Q9. DNA replication is described as 'Semi-conservative.' This means that:
  10. Q10. The 3' to 5' exonuclease activity of DNA Polymerase III is primarily used for:
  11. Q11. Which specific region of the DNA serves as the starting point for replication?
  12. Q12. Eukaryotic DNA replication faces the 'end-replication problem' at the telomeres. Which enzyme solves this by extending the ends of chromosomes?
  13. Q13. What is the role of the 'Sliding Clamp' (beta-subunit in E. coli) in DNA replication?
  14. Q14. During replication, which of the following provides the energy required for the formation of the phosphodiester bond?
  15. Q15. Which eukaryotic DNA polymerase is primarily responsible for the synthesis of the lagging strand?
  16. Q16. The direction of DNA synthesis is always:
  17. Q17. What is a 'Replisome'?
  18. Q18. In eukaryotes, the 'Pre-Replication Complex' is licensed during which phase of the cell cycle?
  19. Q19. Which enzyme is unique for its ability to synthesize a DNA strand using an RNA template?
  20. Q20. What happens to the histones in eukaryotic cells during DNA replication?