Free Biology Notes for Students
Complete Biology Toolkit in One Place
Biology Notes Online provides free study notes, lecture videos and microscopic images covering microbiology, botany, zoology, biochemistry, genetics, cell biology and laboratory methods for A-level, AP, IB, BSc and MSc students.
Free Lecture Videos
Detailed Free Lecture Videos Covering Every Bio Topic – Watch & Master Easily
All Biology Topics
Explore Every Branch of Biology – Dive Deep, Scroll Wide, Learn Fast
- Agricultural Microbiology 12 posts
- Bacteriology 104 posts
- Basic Microbiology 94 posts
- Biochemistry 104 posts
- Bioinformatics 25 posts
- Biotechnology 13 posts
- Cell Biology 128 posts
- Disease 7 posts
- Ecology 33 posts
- Environmental Microbiology 25 posts
- Epidemiology 1 post
- Food Microbiology 58 posts
- Genetics 100 posts
- Immunology 104 posts
- Industrial microbiology 24 posts
- Intellectual Property Rights 9 posts
- Medical Microbiology 37 posts
- Microbiologists 8 posts
- Microscope 28 posts
- Molecular biology 87 posts
- Mycology 49 posts
- Parasitology 33 posts
- Phycology 25 posts
- Prions 2 posts
- Protozoa 16 posts
- Virology 67 posts
- Angiosperms 32 posts
- Archegoniate 12 posts
- Biodiversity 1 post
- Economic Botany 15 posts
- Ethnobotany 5 posts
- Horticultural 10 posts
- Natural Resource Management 3 posts
- Plant Anatomy and Embryology 19 posts
- Plant Breeding 16 posts
- Plant Ecology and Taxonomy 15 posts
- Plant Physiology and Metabolism 19 posts
- Animal Behaviour 1 post
- Basic Zoology 6 posts
- Biology of Insecta 15 posts
- Chordates 27 posts
- Developmental Biology 22 posts
- Endocrinology 17 posts
- Ethology 6 posts
- Evolutionary Biology 21 posts
- Fish and fisheries 25 posts
- Human Anatomy 17 posts
- Neuroscience 17 posts
- Non-chordates 20 posts
- Pest Management 5 posts
- Physiology 52 posts
- Protista 15 posts
- Reproductive Biology 5 posts
- Research Methodology 8 posts
- Vertebrata 13 posts
- Biochemical Test 95 posts
- Botany Practicals 2 posts
- Culture Media 79 posts
- Cytopathology 1 post
- Hematology 7 posts
- Immunology Practical 19 posts
- Instruments 149 posts
- Laboratory Techniques 5 posts
- Laboratory Tests 16 posts
- Microbiology Techniques 25 posts
- Protocols 18 posts
- Staining 43 posts
- Under Microscope 26 posts
- Differences 180 notes
- Intellectual Property Rights 9 notes
- Recommended Books 59 notes
- Research Methodology 8 notes
- Syllabus 14 notes
- Bacteriology 104 posts
- Mycology 49 posts
- Parasitology 33 posts
- Phycology 25 posts
- Prions 2 posts
- Protozoa 16 posts
- Virology 67 posts
Latest Notes
Apoptosis Pathway- Definition, Functions, Mechanism, Examples
Apoptosis is a regulated cell death process by which unwanted, aged or damaged cells are removed from the body. It is commonly referred to…
-
Plasmids: Structure, Types, Functions and Applications
Learn what plasmids are, how they are structured and replicated, their major types and functions, and how plasmids are used in genetics and biotechnology.
-
Plasma Membrane Models: Types, History, Diagrams and Comparison
Learn the major plasma membrane models, from Overton and Gorter-Grendel to the Davson-Danielli, Robertson and Singer-Nicolson fluid mosaic models, with diagrams and comparison.
-
Peripheral Protein: Definition, Membrane Binding, Functions, and Examples
Learn what peripheral proteins are, how they attach to cell membranes, their major functions and examples, and how they differ from integral proteins.
-
Y-Shaped Energy Flow Model – Diagram, Working and Examples
Learn the Y-shaped energy flow model with a labelled diagram, grazing and detritus pathways, examples, advantages, limitations and comparisons.
-
Channel Protein: Structure, Types, Mechanism, and Functions
Learn what a channel protein is, how its selective pore enables membrane transport, major channel types, their functions, and how channels differ from carriers.
-
Red Blood Cell – Morphology, Size, Shape, Color and Inclusion Bodies
Red blood cells constitute the primary cellular component in blood. Red blood cells that are mature are biconcave discs which have no nucleus and…
-
Cytoskeleton: Structure, Components and Functions
Learn how the cytoskeleton is built from actin filaments, intermediate filaments, and microtubules and how it controls cell shape, transport, movement, and division.
-
Microtubules – Definition, Structure, Functions
Learn what microtubules are, how α- and β-tubulin form their structure, why they grow and shrink, and how they support transport, mitosis, cilia, and…
-
Opsonization: Definition, Mechanism, Opsonins, and Examples
Opsonization is the immune process that coats pathogens with opsonins such as IgG and C3b to enhance phagocytosis. Learn its mechanism, receptors, types, examples,…
Discover the Microscopic World
Share and explore stunning microscopic images of microorganisms in our growing community.
Sourav Pan 
