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A1.1 Water

A1.2 Nucleic acids

A2.1 Origins of cells (HL)

A2.2 Cell structure

A2.3 Viruses (HL)

A3.1 Diversity of organisms

A3.2 Classification and cladistics (HL)

A4.1 Evolution and speciation

A4.2 Conservation of biodiversity

B1.1 Carbohydrates and lipids

B1.2 Proteins

B2.1 Membranes and membrane transport

B2.2 Organelles and compartmentalization

B2.3 Cell specialization

B3.1 Gas exchange

B3.2 Transport

B3.3 Muscle and motility (HL)

B4.1 Adaptation to environment

B4.2 Ecological niches

C1.1 Enzymes and metabolism

C1.2 Cell respiration

C1.3 Photosynthesis

C2.1 Chemical signalling (HL)

C2.2 Neural signalling

C3.1 Integration of body systems

C3.2 Defense against disease

C4.1 Populations and communities

C4.2 Transfer of energy and matter

D1.1 DNA replication

D1.2 Protein synthesis

D1.3 Mutations and gene editing

D2.1 Cell and nuclear division

D2.2 Gene expression (HL)

D2.3 Water potential

D3.1 Reproduction

D3.2 Inheritance

D3.3 Homeostasis

D4.1 Natural selection

D4.2 Sustainability and change

D4.3 Climate change

IB Biology Topic A1.2: Nucleic Acids Lessons

Written by IB Experts

This lesson delivers structured, step-by-step lessons that guide students through every part of the IB Biology syllabus for A1.2 Nucleic acids. These lessons simplify complex ideas like molecular biology, evolutionary mechanisms, and homeostasis, while worked examples show how to approach IB-style questions.

Designed for both HL and SL learners, RevisionDojo lessons ensure students not only understand the theory but also know how to apply it in IB Paper exam situations.

With clear explanations, active learning checks, and a syllabus-first design, RevisionDojo makes revision less overwhelming and more effective.

A1.2.1 DNA as the genetic material of all living organisms

A1.2.2 Components of a nucleotide

A1.2.3 Sugar–phosphate bonding and the sugar–phosphate “backbone” of DNA and RNA

A1.2.4 Bases in each nucleic acid that form the basis of a code

A1.2.5 RNA as a polymer formed by condensation of nucleotide monomers

A1.2.6 DNA as a double helix linked by hydrogen bonding between complementary base pairs

A1.2.7 Differences between DNA and RNA

A1.2.8 Complementary base pairing in allowing genetic information to be replicated and expressed

A1.2.9 Diversity of possible DNA base sequences and its capacity for storing information

A1.2.10 Conservation of the genetic code as evidence of universal common ancestry

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

A1.2.12 Purine-to-pyrimidine bonding as a component of DNA helix stability (HL only)

A1.2.13 Structure of a nucleosome (HL only)

A1.2.14 Evidence from the Hershey–Chase experiment for DNA as the genetic material (HL only)

A1.2.15 Chargaff’s data on pyrimidine and purine bases across diverse life forms (HL only)

IB Biology Topic A1.2: Nucleic Acids Lessons

A - Unity and Diversity

B - Form and Function

C - Interaction and Interdependence

D - Continuity and Change

A - Unity and Diversity

B - Form and Function

C - Interaction and Interdependence

D - Continuity and Change

IB Biology Topic A1.2: Nucleic Acids Lessons

Lessons for A1.2 Nucleic acids - IB

IB Biology Topic A1.2: Nucleic Acids Lessons