Resources
Biology study guides
73 published, listed by title. Topic explanations written to be read once and understood.
All 73, by title
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Study Guides
A Level Biology: Biological Molecules (Cambridge 9700)
Testing for biological molecules, carbohydrates and lipids, proteins, and water – the full content of Topic 2 Biological molecules for Cambridge AS & A Level Biology 9700, 2025-2027 series.
Biology · Cambridge · AS LEVEL
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Study Guides
A Level Biology: Cell Structure (Cambridge 9700)
The microscope in cell studies, and cells as the basic units of living organisms – the full content of Topic 1 Cell structure for Cambridge AS & A Level Biology 9700, 2025-2027 series.
Biology · Cambridge · AS LEVEL
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Study Guides
A Level Biology: Enzymes (Cambridge 9700)
The lock-and-key and induced-fit hypotheses, active sites and activation energy, and the factors – temperature, pH, concentration, inhibitors – that affect enzyme-catalysed reaction rates, including Michaelis-Menten kinetics and immobilised enzymes, for Cambridge International AS & A Level Biology 9700.
Biology · Cambridge · AS LEVEL
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Study Guides
AQA A-Level Biology: Biological Molecules (7402)
Monomers and polymers, carbohydrates, lipids, proteins, nucleic acids, ATP, water and inorganic ions – the full content of Topic 1 for AQA AS/A-Level Biology (7401/7402).
Biology · AQA · AS LEVEL
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Study Guides
AQA A-Level Biology: Eukaryotic and Prokaryotic Cell Structure (7402)
The structure and function of eukaryotic organelles, and the differences between prokaryotic cells, eukaryotic cells and viruses – 3.2.1.1 and 3.2.1.2 of AQA AS and A-Level Biology (7401/7402).
Biology · AQA · AS LEVEL
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Study Guides
AQA A-Level Biology: Organisms Exchange Substances With Their Environment (7402)
Surface area to volume ratio, gas exchange, digestion and absorption, and mass transport in animals and plants – the full content of Topic 3.3 for AQA A-Level Biology (7402).
Biology · AQA · AS LEVEL
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Study Guides
AQA GCSE Biology 8461: Bioenergetics – Study Guide
AQA GCSE Biology 8461 Bioenergetics taught from scratch: photosynthesis, limiting factors, respiration, exercise and metabolism, with worked examples.
Biology · AQA · GCSE
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Study Guides
AQA GCSE Biology 8461: Ecology – Study Guide
Study guide for AQA GCSE Biology 8461 Topic 7 Ecology: communities, sampling, cycles, decay, biodiversity, trophic levels and food production.
Biology · AQA · GCSE
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Study Guides
AQA GCSE Biology 8461: Homeostasis and response – Study Guide
Study guide for AQA GCSE Biology 8461 topic 5: homeostasis, nerves, brain, eye, hormones, kidneys, the menstrual cycle and plant hormones.
Biology · AQA · GCSE
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Study Guides
AQA GCSE Biology 8461: Inheritance, variation and evolution – Study Guide
Study guide for AQA GCSE Biology 8461 topic 6: meiosis, DNA, Punnett squares, inherited disorders, evolution, breeding, cloning and classification.
Biology · AQA · GCSE
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Study Guides
AQA GCSE Biology 8461: Key ideas – Study Guide
Study guide to the nine AQA GCSE Biology 8461 key ideas, showing where each appears in the specification and how to use them in linked answers.
Biology · AQA · GCSE
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Study Guides
AQA GCSE Biology: Cell Biology (8461)
Cell structure, cell division, and transport in cells – the full content of Topic 1 Cell biology for AQA GCSE Biology (8461).
Biology · AQA · GCSE
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Study Guides
AQA GCSE Biology: Enzymes and the Digestive System (8461)
Cells, tissues, organs and organ systems, and how digestive enzymes break down food – 4.2.1 and 4.2.2.1 of AQA GCSE Biology (8461), including the lock and key model and required practicals 4 and 5.
Biology · AQA · GCSE
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Study Guides
AQA GCSE Biology: Infection and Response (8461)
Pathogens and communicable diseases, human defence systems, vaccination, antibiotics and drug development, plus the Biology-only content on monoclonal antibodies and plant disease – the full content of Topic 4.3 for AQA GCSE Biology (8461).
Biology · AQA · GCSE
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Study Guides
Biological Molecules
The chemical elements and building blocks of carbohydrates, lipids, proteins and DNA, and the food tests used to identify them, for Cambridge O Level Biology 5090.
Biology · Cambridge · O LEVELS
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Study Guides
Cambridge IGCSE Biology 0610: Biological molecules – Study Guide
Study guide for Cambridge IGCSE Biology 0610 topic 4: elements, building blocks, the five food tests and DNA structure, with worked examples.
Biology · Cambridge · IGCSE
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Study Guides
Cambridge IGCSE Biology 0610: Biotechnology and genetic modification – Study Guide
Study guide to Cambridge IGCSE Biology 0610 topic 21: bacteria in biotechnology, yeast, enzymes, fermenters and genetic modification, Core and Extended.
Biology · Cambridge · IGCSE
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Study Guides
Cambridge IGCSE Biology 0610: Coordination and response – Study Guide
Study guide for Cambridge IGCSE Biology 0610 topic 14: nerves, synapses, the eye, hormones, homeostasis and tropisms, with Extended content labelled.
Biology · Cambridge · IGCSE
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Study Guides
Cambridge IGCSE Biology 0610: Diseases and immunity – Study Guide
Study guide to pathogens, transmission, body defences, disease control, immunity, vaccination and cholera, Core and Extended, for Cambridge IGCSE 0610.
Biology · Cambridge · IGCSE
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Study Guides
Cambridge IGCSE Biology 0610: Drugs – Study Guide
Study guide to Cambridge IGCSE Biology 0610 topic 15: what a drug is, how antibiotics treat bacterial infections and how resistance such as MRSA develops.
Biology · Cambridge · IGCSE
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Study Guides
Cambridge IGCSE Biology 0610: Enzymes – Study Guide
Study guide for Cambridge IGCSE Biology 0610 topic 5, Enzymes: catalysts, active sites, temperature and pH, investigations and rate calculations.
Biology · Cambridge · IGCSE
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Study Guides
Cambridge IGCSE Biology 0610: Excretion in humans – Study Guide
Study guide for Cambridge IGCSE Biology 0610 topic 13: lungs, kidneys, the nephron, deamination and urea, with Core and Extended content labelled.
Biology · Cambridge · IGCSE
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Study Guides
Cambridge IGCSE Biology 0610: Gas exchange in humans – Study Guide
Gas exchange surfaces, the breathing system, ventilation, inspired and expired air and breathing in exercise, taught for Cambridge IGCSE Biology 0610.
Biology · Cambridge · IGCSE
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Study Guides
Cambridge IGCSE Biology 0610: Human influences on ecosystems – Study Guide
Study guide for Cambridge IGCSE Biology 0610 topic 20: food production, habitat destruction, pollution, eutrophication and conservation, with examples.
Biology · Cambridge · IGCSE
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Study Guides
Cambridge IGCSE Biology 0610: Inheritance – Study Guide
Study guide for Cambridge IGCSE Biology 0610 topic 17: genes and proteins, mitosis, meiosis and monohybrid crosses, with worked genetic diagrams.
Biology · Cambridge · IGCSE
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Study Guides
Cambridge IGCSE Biology 0610: Organisms and their environment – Study Guide
Study guide for Cambridge IGCSE Biology 0610 topic 19: energy flow, food webs, ecological pyramids, carbon and nitrogen cycles, and population growth.
Biology · Cambridge · IGCSE
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Study Guides
Cambridge IGCSE Biology 0610: Plant nutrition – Study Guide
Study guide to photosynthesis, limiting factors and leaf structure, with worked practical examples, for Cambridge IGCSE Biology 0610 Core and Extended.
Biology · Cambridge · IGCSE
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Study Guides
Cambridge IGCSE Biology 0610: Reproduction – Study Guide
Study guide to Cambridge IGCSE Biology 0610 topic 16: asexual and sexual reproduction, flowers, human reproduction, sex hormones and STIs.
Biology · Cambridge · IGCSE
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Study Guides
Cambridge IGCSE Biology 0610: Respiration – Study Guide
Uses of energy, aerobic and anaerobic respiration, the yeast temperature investigation and oxygen debt, taught in steps for Cambridge IGCSE Biology 0610.
Biology · Cambridge · IGCSE
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Study Guides
Cambridge IGCSE Biology 0610: Transport in animals – Study Guide
Study guide teaching circulatory systems, the heart, blood vessels and blood, with Core and Extended content marked, for Cambridge IGCSE Biology 0610.
Biology · Cambridge · IGCSE
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Study Guides
Cambridge IGCSE Biology 0610: Transport in plants – Study Guide
Study guide to xylem and phloem, water uptake, transpiration, wilting and translocation, with worked examples, for Cambridge IGCSE Biology 0610.
Biology · Cambridge · IGCSE
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Study Guides
Cambridge IGCSE Biology 0610: Variation and selection – Study Guide
Study guide for Cambridge IGCSE Biology 0610 topic 18: variation, mutation, adaptive features, natural selection and selective breeding, with examples.
Biology · Cambridge · IGCSE
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Study Guides
Cambridge International AS & A Level Biology 9700: Cell membranes and transport – Study Guide
Study guide for Cambridge 9700 topic 4: the fluid mosaic model, cell signalling, diffusion, osmosis, active transport and SA:V, with worked examples.
Biology · Cambridge · AS LEVEL
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Study Guides
Cambridge International AS & A Level Biology 9700: Classification, biodiversity and conservation – Study Guide
Study guide for Cambridge 9700 topic 18: species concepts, domains and kingdoms, sampling, Simpson's index, correlation tests and conservation.
Biology · Cambridge · A LEVEL
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Study Guides
Cambridge International AS & A Level Biology 9700: Control and coordination – Study Guide
Study guide for Cambridge 9700 topic 15: action potentials, synapses, muscle contraction, the Venus fly trap, auxin and gibberellin, with worked examples.
Biology · Cambridge · A LEVEL
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Study Guides
Cambridge International AS & A Level Biology 9700: Energy and respiration – Study Guide
ATP, RQ, glycolysis, the link reaction, Krebs cycle, oxidative phosphorylation and fermentation taught step by step for Cambridge A Level Biology 9700.
Biology · Cambridge · A LEVEL
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Study Guides
Cambridge International AS & A Level Biology 9700: Gas exchange – Study Guide
The human gas exchange system from scratch: airways, tissues, plan diagrams and alveolar gas exchange, with worked examples, for Cambridge 9700 Biology.
Biology · Cambridge · AS LEVEL
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Study Guides
Cambridge International AS & A Level Biology 9700: Genetic technology – Study Guide
Study guide for Cambridge 9700 topic 19: recombinant DNA, enzymes and vectors, PCR, electrophoresis, microarrays, gene therapy, screening and GM crops.
Biology · Cambridge · A LEVEL
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Study Guides
Cambridge International AS & A Level Biology 9700: Homeostasis – Study Guide
Study guide for Cambridge 9700 topic 14: negative feedback, the kidney and nephron, ADH, glucagon cell signalling, insulin, biosensors and guard cells.
Biology · Cambridge · A LEVEL
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Study Guides
Cambridge International AS & A Level Biology 9700: Immunity – Study Guide
Study guide to phagocytes, antigens, primary and secondary responses, antibodies, monoclonal antibodies and vaccination for Cambridge 9700 AS Biology.
Biology · Cambridge · AS LEVEL
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Study Guides
Cambridge International AS & A Level Biology 9700: Infectious diseases – Study Guide
Study guide to cholera, malaria, TB and HIV/AIDS, their transmission and control, penicillin and antibiotic resistance for Cambridge 9700 AS Biology.
Biology · Cambridge · AS LEVEL
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Study Guides
Cambridge International AS & A Level Biology 9700: Inheritance – Study Guide
Study guide for Cambridge 9700 A Level Biology topic 16: meiosis, genetic crosses, linkage, epistasis, chi-squared, the lac operon and gibberellin.
Biology · Cambridge · A LEVEL
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Study Guides
Cambridge International AS & A Level Biology 9700: Nucleic acids and protein synthesis – Study Guide
Study guide to nucleotides, DNA structure, semi-conservative replication, transcription, translation and mutation for Cambridge 9700 AS Biology.
Biology · Cambridge · AS LEVEL
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Study Guides
Cambridge International AS & A Level Biology 9700: Photosynthesis – Study Guide
Chloroplasts, pigments, Rf values, photophosphorylation, the Calvin cycle and limiting factors, taught from scratch for Cambridge A Level Biology 9700.
Biology · Cambridge · A LEVEL
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Study Guides
Cambridge International AS & A Level Biology 9700: Selection and evolution – Study Guide
Study guide for Cambridge 9700 A Level Biology topic 17: variation, the t-test, natural and artificial selection, Hardy-Weinberg and speciation.
Biology · Cambridge · A LEVEL
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Study Guides
Cambridge International AS & A Level Biology 9700: The mitotic cell cycle – Study Guide
Study guide for Cambridge 9700 topic 5: chromosome structure, the cell cycle, telomeres, stem cells, tumours and mitosis stages, with worked examples.
Biology · Cambridge · AS LEVEL
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Study Guides
Cambridge International AS & A Level Biology 9700: Transport in mammals – Study Guide
Blood vessels, blood cells, tissue fluid, oxygen and carbon dioxide transport and the cardiac cycle, taught step by step for Cambridge 9700 AS Biology.
Biology · Cambridge · AS LEVEL
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Study Guides
Cambridge International AS & A Level Biology 9700: Transport in plants – Study Guide
Study guide to xylem and phloem structure, plan diagrams, water pathways, cohesion-tension, xerophytes and phloem mass flow for Cambridge 9700 AS Biology.
Biology · Cambridge · AS LEVEL
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Study Guides
Cell Structure and Organisation
Animal, plant and bacterial cell structure, cell specialisation, and the organisation of cells into tissues and organs, for Cambridge O Level Biology 5090.
Biology · Cambridge · O LEVELS
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Study Guides
Edexcel A Level Biology: Molecules, Transport and Health (YBI11)
Carbohydrates and lipids, the heart and circulation, and the risk factors and evidence behind cardiovascular disease – the full learning outcomes of Topic 1 for Pearson Edexcel International A Level Biology (YBI11), examined as Unit 1.
Biology · Pearson Edexcel · A LEVELS
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Study Guides
Edexcel A-Level Biology: Gas Exchange Surfaces, Membranes and Osmosis (YBI11)
Properties of gas exchange surfaces, Fick's Law, cell membrane structure and the fluid mosaic model, and osmosis and membrane transport – outcomes 2.1-2.5 of Pearson Edexcel International A-Level Biology (YBI11), Topic 2.
Biology · Pearson Edexcel · A LEVELS
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Study Guides
Edexcel IGCSE Biology: The Nature and Variety of Living Organisms (4BI1)
Characteristics of living organisms and the variety of living organisms (plants, animals, fungi, protoctists, bacteria and pathogens) – the opening topic of Pearson Edexcel International GCSE Biology (4BI1), an untiered, linear qualification.
Biology · Pearson Edexcel · IGCSE
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Study Guides
Edexcel International GCSE Biology 4BI1: Ecology and the environment – Study Guide
Study guide for Edexcel IGCSE Biology 4BI1 Topic 4: quadrats, food chains, energy transfer, carbon and nitrogen cycles and human impacts.
Biology · Pearson Edexcel · IGCSE
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Study Guides
Edexcel International GCSE Biology 4BI1: Use of biological resources – Study Guide
Study guide for Edexcel IGCSE Biology 4BI1 Topic 5: crop yield, yeast and yoghurt, fermenters, selective breeding, genetic modification and cloning.
Biology · Pearson Edexcel · IGCSE
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Study Guides
Edexcel International GCSE Biology: Reproduction and Inheritance (4BI1)
Sexual and asexual reproduction in plants and humans, DNA and the genome, monohybrid inheritance, mitosis and meiosis, variation, mutation and natural selection – Topic 3 of Pearson Edexcel International GCSE Biology (4BI1).
Biology · Pearson Edexcel · IGCSE
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Study Guides
Enzymes
Enzymes as biological catalysts, the lock-and-key model of enzyme specificity, and the effects of temperature and pH on enzyme activity, for Cambridge O Level Biology 5090.
Biology · Cambridge · O LEVELS
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Study Guides
IB Diploma Programme Biology: Syllabus Guide
The four syllabus themes of IB Diploma Programme Biology – Unity and diversity, Form and function, Interaction and interdependence, and Continuity and change – with real sub-topic names, HL-only content marked, and recommended teaching hours, for first assessment 2025.
Biology · International Baccalaureate · IB
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Study Guides
IB DP Biology Theme A: Unity and Diversity — Study Guide
The full content of IB Diploma Programme Biology's Theme A – water, nucleic acids, origins of cells, cell structure, viruses, classification, evolution and speciation, and conservation of biodiversity – with HL-only content marked.
Biology · International Baccalaureate · IB
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Study Guides
IB DP Biology Theme B: Form and Function — Study Guide
The full content of IB Diploma Programme Biology's Theme B – carbohydrates and lipids, proteins, membranes, organelles, cell specialization, gas exchange and transport, muscle and motility, and adaptation to environment – with HL-only content marked.
Biology · International Baccalaureate · IB
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Study Guides
IGCSE Biology: Characteristics and Classification of Living Organisms (Cambridge 0610)
The seven characteristics of life, the binomial naming system and dichotomous keys, and how organisms are placed into kingdoms and groups – the full content of Topic 1 for Cambridge IGCSE Biology 0610, 2026-2028 series.
Biology · Cambridge · IGCSE
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Study Guides
IGCSE Biology: Human Nutrition (Cambridge 0610)
Diet, the alimentary canal, physical and chemical digestion, enzymes and absorption, with the Core and Supplement split marked exactly as the official syllabus states it – the full content of Topic 7 for Cambridge IGCSE Biology 0610, 2026-2028 series.
Biology · Cambridge · IGCSE
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Study Guides
IGCSE Biology: Movement Into and Out of Cells (Cambridge 0610)
Diffusion, osmosis and active transport, with the Core and Supplement split marked exactly as the official syllabus states it – the full content of Topic 3 for Cambridge IGCSE Biology 0610, 2026-2028 series.
Biology · Cambridge · IGCSE
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Study Guides
IGCSE Biology: Organisation of the Organism (Cambridge 0610)
Comparing plant, animal and bacterial cell structure, naming six specialised cells and their functions, and calculating magnification from image and actual size – the full content of Topic 2 for Cambridge IGCSE Biology 0610, 2026-2028 series.
Biology · Cambridge · IGCSE
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Study Guides
OCR A Level Biology: Exchange and Transport (H420)
Gas exchange, mass transport in animals, and transport in plants – Module 3 of OCR A Level Biology A (H420), distinct from the site's existing guides to Foundations in Biology and Development of Practical Skills.
Biology · OCR · A LEVELS
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Study Guides
OCR A Level Biology: Foundations in Biology (H420)
Cell structure, biological molecules, and nucleotides and nucleic acids – the opening content of Module 2 for OCR A Level Biology A (H420), Version 4.1.
Biology · OCR · A LEVELS
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Study Guides
OCR A-Level Biology: Development of Practical Skills (H420)
Practical skills assessed in the written examinations and practical skills assessed in the Practical Endorsement – the full content of Module 1 for OCR A-Level Biology A (H420).
Biology · OCR · A LEVELS
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Study Guides
OCR GCSE Biology: Cell Level Systems (J247)
Cell structures and microscopy, DNA and protein synthesis, enzymes, respiration and the synthesis and breakdown of biological molecules, and photosynthesis, including experiments to investigate it – a study guide to Topic B1 Cell level systems for OCR GCSE Gateway Science Suite Biology A (J247).
Biology · OCR · GCSE
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Study Guides
OCR GCSE Biology: Scaling Up (J247)
Supplying the cell and the challenges of size – the full content of Topic B2 Scaling Up for OCR GCSE (9-1) Biology A (Gateway Science) (J247), including diffusion, osmosis, mitosis, stem cells, and the human circulatory and plant transport systems.
Biology · OCR · GCSE
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Study Guides
OxfordAQA A-Level Biology: The Causes of Disease (9610)
How pathogens cause disease, and the lifestyle risk factors linked to coronary heart disease and cancer – 3.2.1 of OxfordAQA International AS and A-Level Biology (9610), opening Unit 2: Biological Systems and Disease.
Biology · OxfordAQA · AS LEVEL
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Study Guides
OxfordAQA A-Level Biology: The Diversity of Living Organisms (9610)
Species and taxonomy, biodiversity within a community and random sampling in investigations of variation, from Unit 1 of OxfordAQA International AS & A-Level Biology (9610), the first of two units forming the International AS.
Biology · OxfordAQA · AS LEVEL
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Study Guides
OxfordAQA IGCSE Biology: Bioenergetics (9201)
Photosynthesis, exchange and transport in plants, human circulation, digestion, breathing and respiration – the six sub-topics of Bioenergetics in OxfordAQA International GCSE Biology (9201).
Biology · OxfordAQA · IGCSE
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Study Guides
OxfordAQA IGCSE Biology: Organisation (9201)
Cell structure, tissues and organ systems – the opening topic of OxfordAQA International GCSE Biology (9201), largely co-teachable with OxfordAQA International GCSE Combined Science (9204).
Biology · OxfordAQA · IGCSE
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Study Guides
Pearson Edexcel IGCSE Biology: Cell Structure and Biological Molecules (4BI1)
Cell structures and their functions, plant vs animal cells, and the three major biological molecules – sub-topics (b) and (c) of Topic 2 Structures and Functions in Living Organisms, Pearson Edexcel International GCSE Biology (4BI1).
Biology · Pearson Edexcel · IGCSE