Cambridge AS & A Level Biology
6.1Structure of nucleic acids and replication of DNA
Structure of nucleic acids and replication of DNA in Cambridge AS & A Level Biology: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic35 practice questions2 lessons
Learning objectives
What the syllabus expects you to be able to do.
- 6.1.1Describe the structure of nucleotides, including ATP (no structural formulae).
- 6.1.2State that adenine and guanine are double-ring purines and cytosine, thymine and uracil single-ring pyrimidines.
- 6.1.3Describe DNA as an antiparallel double helix with complementary base pairing, different hydrogen bonding in C-G and A-T and phosphodiester bonds.
- 6.1.4Describe semi-conservative replication in S phase, with DNA polymerase, DNA ligase and leading and lagging strands.
- 6.1.5Describe the structure of an RNA molecule, using mRNA.
Lessons
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Nucleotides and the structure of DNA and RNA
35 min
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Semi-conservative replication of DNA
35 min
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Sample question
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