Find a concept, understand how it works, then use a question to check your reasoning. This directory connects biology lessons across school, introductory college and university plant science.
Choose your topic
Cell Biology
Cells, membranes, organelles and cell division.
Genetics
Inheritance, variation and interpreting genetic crosses.
Human Biology
Circulation, homeostasis and the immune system.
Plant Biology
Plant structures, transport, growth and reproduction.
Ecology
Populations, interactions and biodiversity.
Biochemistry
Biomolecules, enzymes and metabolic pathways.
Microbiology
Bacteria, viruses and microbial calculations.
Evolution
Variation, selection and changes in populations.
Molecular Biology
DNA, RNA, gene expression and repair.
Choose a useful starting point
Begin with cells and biological molecules if the subject is new. Study inheritance before population genetics, and learn enzyme action before metabolic pathways. When you use a diagram, explain each arrow as well as each label.
Put your knowledge to work
Practice questions and quizzes · Biology study tools · Advanced Botany Courses
Using these resources for an exam
General lessons explain shared biology concepts. Course coverage varies; these resources are not a complete AP, GCSE, IGCSE or A-level syllabus. Check the current specification from your exam provider for assessed content, practical requirements and command words.
Class 11, Class 12 and MDCAT resources remain available in a separate curriculum directory.
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