Topic 02Biology
A1.2 Nucleic acids
DNA and RNA store and transfer genetic information; their structure (nucleotides, antiparallel double helix, complementary base pairing) underpins faithful replication and expression.
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Nucleotides and the polynucleotide backboneSign up
Components of a nucleotide · Phosphodiester bonds and 5′→3′ directionality
30 min
The double helix and base pairingSign up
Antiparallel strands & base pairing · DNA vs RNA & the universal code
30 min
Evidence for DNA as genetic material (AHL)HLSign up
Nucleosome packaging · Hershey-Chase experiment · Chargaff's rules & falsifiability
30 min