D1.1 DNA replication Quiz
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5 questions, one answer each
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1. Which enzyme separates the two DNA strands in a cell?
- A. DNA ligase
- B. Helicase
- C. DNA primase
- D. DNA polymerase I
2. Why is Taq polymerase used in PCR?
- A. It makes RNA primers
- B. It is heat-stable
- C. It joins fragments
- D. It separates strands
3. HL: New DNA strands are synthesised in the direction:
- A. 3' to 5'
- B. 5' to 3'
- C. Either direction
- D. Towards the origin only
4. HL: Which enzyme removes RNA primers and replaces them with DNA?
- A. DNA polymerase III
- B. DNA polymerase I
- C. DNA ligase
- D. Helicase
5. HL: How often must an RNA primer be made on the lagging strand?
- A. Only once
- B. Once for every Okazaki fragment
- C. Never
- D. Only at the end of the chromosome