A Levels Biology (9700)•9700/12/O/N/22
Explanation
Semi-conservative DNA replication facts Steps:
- Identify location: Eukaryotic DNA replication occurs in nucleus, not cytoplasm (A false).
- Check base pairing: DNA uses A-T, not A-U (uracil in RNA) (B false).
- Define semi-conservative: Each daughter DNA has one parental strand and one new strand (C true).
- Verify base composition: Replication preserves nucleotide percentages via complementary pairing (D true). Why 2 are correct:
- C and D align with semi-conservative model and Chargaff's rules. Why A is wrong:
- DNA replication in eukaryotes is nuclear, not cytoplasmic. Why B is wrong:
- Template is DNA, pairing A with T, not U. Why the others are correct:
- Not applicable; C and D are accurate.
Final answer: 2
Topic: Structure of nucleic acids and replication of DNA
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