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If you're seeing this message, it means we're having trouble loading external resources on our website. org are unblocked. To log in and use all the features of Khan Academy, please enable JavaScript in your browser. Donate Login Sign up Search for courses, skills, and videos. Welcome to the Biology library! Biology is the study of life. Here, you can browse videos, articles, and exercises by topic. We keep the library up-to-date, so you may find new or improved content over time.
Course summary, biology help online. Intro to biology. Welcome to biology! Chemistry of life. Elements and atoms : Chemistry of life Electron shells and orbitals : Chemistry of life Chemical bonds and reactions : Chemistry of life. Water, acids, and bases. Hydrogen bonding in water : Water, acids, and bases Cohesion and adhesion : Water, acids, and bases Temperature and state changes in water : Water, acids, and bases.
Acids, bases, and pH : Water, acids, and bases. Properties of carbon. Carbon : Properties of carbon Hydrocarbon structures and functional groups : Properties of carbon. Introduction to macromolecules : Macromolecules Carbohydrates : Macromolecules Lipids : Macromolecules.
Nucleic acids : Macromolecules Proteins : Macromolecules. Elements of life. More about macromolecules : Elements of life, biology help online. Energy and enzymes. Energy in metabolism : Energy and enzymes Laws of thermodynamics : Energy and biology help online Free energy : Energy and enzymes. ATP and reaction coupling : Energy and enzymes Introduction to enzymes : Energy and enzymes Enzyme regulation : Energy and enzymes. Structure of a cell.
Introduction to cells : Structure of a cell Prokaryotic and eukaryotic cells : Structure of a cell Tour of a eukaryotic cell : Structure of a cell. Extracellular structures and cell-cell junctions : Structure of a cell. More about cells. Cell movement : More about cells Cell size : More about cells Prokaryotes and eukaryotes : More about cells. Membranes and transport. The plasma membrane : Membranes and transport Diffusion and osmosis : Membranes and transport Passive transport : Membranes and transport.
Active transport : Membranes and transport Bulk transport : Membranes and transport. More about membranes. Cell membranes : More about membranes Transport : More about membranes. Cellular respiration. Introduction to cellular respiration : Cellular respiration Steps of cellular respiration : Cellular respiration Glycolysis : Cellular respiration.
Pyruvate oxidation and the citric acid cycle : Cellular respiration Oxidative phosphorylation : Cellular respiration Variations on cellular respiration : Cellular respiration. Intro to photosynthesis : Photosynthesis The light-dependent reactions : Photosynthesis The Calvin cycle : Photosynthesis.
Photorespiration: C3, C4, and CAM plants : Photosynthesis. Cell signaling. How cells signal to each other : Cell signaling Communication in single-celled organisms : Cell signaling Communication in multicellular organisms : Cell signaling. Feedback : Cell signaling. Cell division. Introduction to cell division : Cell division The cell cycle and mitosis : Cell division Meiosis : Cell division. Cell cycle regulation, biology help online, cancer, and stem cells : Cell division.
Classical and molecular genetics. Mendelian genetics : Classical and molecular genetics Variations on Mendelian genetics : Classical and molecular genetics Chromosomal basis of genetics : Classical and molecular genetics. DNA as the genetic material. Structure of DNA : DNA as the genetic material Discovery of DNA : DNA as the genetic material DNA replication : DNA as the genetic material. Central dogma DNA to RNA to protein. Central dogma and the genetic code : Central dogma DNA to RNA biology help online protein Transcription : Central dogma DNA to RNA to protein Translation : Central dogma DNA to RNA to protein.
Gene regulation. Gene regulation in bacteria : Gene regulation Gene regulation in eukaryotes : Gene regulation. Intro to biotechnology : Biotechnology DNA cloning : Biotechnology DNA analysis methods : Biotechnology. More molecular biology. More about DNA and RNA : More molecular biology More about genetics : More molecular biology Mutations : More molecular biology. Metabolism : More molecular biology More about cell cycle : More molecular biology More about biotechnology : More molecular biology.
Developmental biology. Bacteria and archaea. Prokaryote structure : Bacteria biology help online archaea Prokaryote metabolism biology help online ecology : Bacteria and archaea. Viruses : Viruses. Evolution and the tree of life, biology help online. Evolution and natural selection : Evolution and the tree of life Population genetics : Evolution and the tree of life Speciation and evolutionary trees : Evolution and the tree of life.
More about evolution and natural selection, biology help online. Evidence of evolution : More about evolution and natural selection Artificial selection : More about evolution and natural selection More about populations : More about evolution and natural selection.
More evolution and natural selection practice : More about evolution and natural selection. History of life on Earth. Formation of Earth and early life : History of life on Earth The diversification of life : History of life on Earth Radiometric dating : History of life on Earth.
More about ecology. More about population ecology : More about ecology Life histories : More about ecology More ecology practice biology help online More about ecology.
Biodiversity and conservation. Protecting biodiversity : Biodiversity and conservation Levels of biodiversity : Biodiversity and conservation. Behavioral biology. Animal behavior : Biology help online biology. Principles of physiology. Human biology, biology help online. Circulatory and pulmonary systems : Human biology The neuron and nervous system : Human biology The kidney and nephron : Human biology, biology help online.
Muscles : Human biology Immunology : Human biology. Plant biology. Plant responses to light : Plant biology. AP free response worked examples.
Crash Course: Biology and Ecology. Crash Course: Biology : Crash Course: Biology and Ecology Crash Course: Ecology : Crash Course: Biology and Ecology. Meet the biology professional. Meet the biology professional : Meet the biology professional. Community questions. Biology is brought to you with support from the Amgen Foundation, biology help online.
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