Biology: every topic explained
34 short explanations for Biology, one per syllabus topic: the idea, the rules, the common mistake and a worked example. Each one links to our notes and a free test on that topic.
A Unity and diversity
- Water
- Nucleic acids
- Cell structure
- Diversity of organisms
- Evolution and speciation
- Conservation of biodiversity
B Form and function
- Carbohydrates and lipids
- Proteins
- Membranes and membrane transport
- Organelles and compartmentalization
- Cell specialization
- Gas exchange
- Transport
- Adaptation to environment
- Ecological niches
C Interaction and interdependence
- Enzymes and metabolism
- Cell respiration
- Photosynthesis
- Neural signalling
- Integration of body systems
- Defence against disease
- Populations and communities
- Transfers of energy and matter
D Continuity and change
- DNA replication
- Protein synthesis
- Mutations and gene editing
- Cell and nuclear division
- Water potential
- Reproduction
- Inheritance
- Homeostasis
- Natural selection
- Stability and change
- Climate change
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