EduNinja

A Unity and Diversity

A1.2 Nucleic acids

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

B1.1 Carbohydrates and lipids

B2.1 Membranes and membrane transport

B2.2 Organelles and compartmentalization

B2.3 Cell specialization

B3.1 Gas exchange

B3.3 Muscle and motility [HL only]

B4.1 Adaptation to environment

B4.2 Ecological niches

C Interaction and Interdependence

C1.1 Enzymes and metabolism

C1.2 Cell respiration

C1.3 Photosynthesis

C2.1 Chemical signalling [HL only]

C2.2 Neural signalling

C3.1 Integration of body systems

C3.2 Defence against disease

C4.1 Populations and communities

C4.2 Transfers of energy and matter

C4.2.1—Ecosystems as open systems

C4.2.2—Sunlight as principal energy source

C4.2.3—Chemical energy flow

C4.2.4—Food chains and food webs

C4.2.5—Supply to decomposers

C4.2.6—Autotrophs as self-feeders

C4.2.7—Energy sources

C4.2.8—Heterotrophs

C4.2.9—Energy release

C4.2.10—Trophic levels

C4.2.11—Energy pyramids

C4.2.12—Energy reductions

C4.2.13—Heat loss

C4.2.14—Restrictions on trophic levels

C4.2.15—Primary production

C4.2.16—Secondary production

C4.2.17—Carbon cycle diagrams

C4.2.18—Carbon sinks and sources

C4.2.19—CO₂ release during combustion

C4.2.20—Keeling Curve analysis

C4.2.21—Dependence between respiration and photosynthesis

C4.2.22—Recycling of all chemical elements

D Continuity and Change

D1.1 DNA replication

D1.2 Protein synthesis

D1.3 Mutation and gene editing

D2.1 Cell and nuclear division

D2.2 Gene expression [HL only]

D2.3 Water potential

D3.1 Reproduction

D3.2 Inheritance

D3.3 Homeostasis

D4.1 Natural selection

D4.2 Stability and change

D4.3 Climate change

C4.2.14—Restrictions on trophic levels Topic Practice

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