Main content

High school biology

Biology foundations

Biology and the scientific method: Biology foundationsImportant molecules for biology: Biology foundationsWater and life: Biology foundations
pH, acids, and bases: Biology foundations

Cells

Introduction to cells: CellsBasic cell structures: CellsThe cell membrane: Cells
Eukaryotic cell structures: CellsProkaryotes and eukaryotes: CellsPlant vs animal cells: Cells

Energy and transport

Introduction to metabolism: Energy and transportEnzymes: Energy and transportPassive and active transport: Energy and transport
Osmosis and tonicity: Energy and transportPhotosynthesis: Energy and transportCellular respiration: Energy and transport

Reproduction and cell division

Types of reproduction: Reproduction and cell divisionChromosome structure and numbers: Reproduction and cell divisionThe cell cycle and mitosis: Reproduction and cell division
Meiosis: Reproduction and cell divisionFertilization and development: Reproduction and cell division

Classical genetics

Introduction to heredity: Classical geneticsNon-Mendelian inheritance: Classical geneticsSex linkage: Classical genetics
Pedigrees: Classical genetics

Molecular genetics

DNA structure and replication: Molecular geneticsRNA and protein synthesis: Molecular geneticsBiotechnology: Molecular genetics

Evolution

Evolution and natural selection: EvolutionEvidence of evolution: EvolutionPhylogeny: Evolution

Human body systems

Body structure and homeostasis: Human body systemsThe circulatory and respiratory systems: Human body systemsThe musculoskeletal system: Human body systems
The digestive and excretory systems: Human body systemsThe nervous and endocrine systems: Human body systemsThe reproductive system: Human body systemsThe immune system: Human body systems

Ecology

Introduction to ecology: EcologyPopulation ecology: EcologyCommunity ecology: Ecology
Ecological relationships: EcologyTrophic levels: EcologyBiogeochemical cycles: EcologyHuman impact on ecosystems: Ecology

Recommended

Biology overview
Preparing to study biology
What is life?
The scientific method
The scientific method

Get Started
Biology and the scientific method

How do biologists study the world around them? Learn about the scientific method, experiments, and other tools scientists use to test their ideas and make discoveries.
Start learning
Community questions