IB Biology HL A1.2.12 Hl Purine to Pyrimidine Bonding and Helix Stability Topic Practice

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A Unity and Diversity

A1.2 Nucleic acids

A1.2.1—DNA as genetic material

A1.2.2—Components of a nucleotide

A1.2.3—Sugar-phosphate bonding

A1.2.4—Bases form the basis of a code

A1.2.5—RNA as a polymer

A1.2.6—DNA as a double helix

A1.2.7—Differences between DNA and RNA

A1.2.8—Complementary base pairing

A1.2.9—Diversity of DNA base sequences

A1.2.10—Conservation of genetic code

A1.2.11 (HL)—Directionality of RNA and DNA

A1.2.12 (HL)—Purine-to-pyrimidine bonding and helix stability

A1.2.13 (HL)—Structure of a nucleosome

A1.2.14 (HL)—Hershey-Chase experiment

A1.2.15 (HL)—Chargaff's data

A2.1 Origins of cells

A2.2 Cell structure

A2.3 Viruses [HL only]

A3.1 Diversity of organisms

A3.2 Classification and cladistics [HL only]

A4.1 Evolution and speciation

A4.2 Conservation of biodiversity

B Form and Function

C Interaction and Interdependence

D Continuity and Change

IB/Biology/HL//Question Bank/A Unity and Diversity/A1.2 Nucleic acids/A1.2.12 (HL)—Purine-to-pyrimidine bonding and helix stability

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