D1.1 DNA replication Quiz
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5 questions, one answer each
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1. In semi-conservative replication, each new DNA molecule contains:
- A. Two new strands
- B. Two original strands
- C. One original and one new strand
- D. Pieces of old and new DNA mixed in each strand
2. Which enzyme breaks hydrogen bonds between the two DNA strands during replication in cells?
- A. DNA polymerase
- B. Helicase
- C. Taq polymerase
- D. RNA polymerase
3. In PCR, what happens at about 55 °C?
- A. Strands separate
- B. Primers bind to the template
- C. Taq polymerase is denatured
- D. Nucleotides are broken down
4. Starting with 4 copies, how many copies are present after 10 PCR cycles?
- A. 40
- B. 1024
- C. 4096
- D. 400
5. In gel electrophoresis, DNA fragments are separated according to:
- A. Their base sequence
- B. Their length
- C. Their colour
- D. Whether they are from the mother or father