Khan Academy
Khan Academy: Energy and Enzymes: Activation Energy
An information page about activation energy. Learn about activation energy, transition states, and reaction rates.
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Khan Academy: Enzymes and the Active Site
An article reviewing over enzymes and active sites.
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Khan Academy: Energy and Enzymes: Enzyme Regulation
Review over the factors that can control enzymatic activity with this article.
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Khan Academy: Basics of Enzyme Kinetics Graphs
Learn about the basics of enzyme kinetics graphs, and see examples of the graphs to understand the valuable data that is found on the graph. [12 min, 29 sec]
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Khan Academy: Biology: Structure of a Cell: Introduction to Cells
Learn about cell theory in this article. [12:29]
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Khan Academy: Biology: Structure of a Cell:prokaryotic Cells
Review over characteristcs of cella specifically prokaryotic cells in this article.
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Khan Academy: Biology: Structure of a Cell: Introduction to Eukaryotic Cells
An article reviewing the structure of eukaryotic cells. Learn how the cells have a nucleus, organelles, and chromosomes.
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Khan Academy: Plasma Membrane and Cytoplasm
Article takes an in-depth look at the structure and function of the plasma membrane and cytoplasm of cells, the phospholipid bilayer, and microvilli.
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Khan Academy: Nucleus and Ribosomes
Discussion in detail of the structure and function of the nucleus and ribosomes of a cell and how they work together in the production of proteins.
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Khan Academy: The Endomembrane System
Article looks at the structure and function of the different parts of the endomembrane system, how proteins, lipids, and vesicles are transported between these parts, and how this activity keeps the cell running smoothly.
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Khan Academy: Mitochondria and Chloroplasts
Resource takes a look at the structure and function of the organelles mitochondria and chloroplasts. It also examines endosymbiosis, where the organelles probably came from.
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Khan Academy: The Cytoskeleton
There are three types of protein fibers in the cytoskeleton: microfilaments, intermediate filaments, and microtubules. This resource examines each type of filament, as well as some specialized structures: flagella, cilia, and centrosomes.
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Khan Academy: The Extracellular Matrix and Cell Wall
Article examines the external structures of the extracellular matrix and the cell wall and looks at the role they play in different cell types.
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Khan Academy: Cell Cell Junctions
Learn about the different types of intercellular junctions, including plasmodesmata, tight junctions, gap junctions, and desmosomes.
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Khan Academy: Structure of the Plasma Membrane
Article takes a look at the different components (protein, lipid, cholesterol, and carbohydrate) of the plasma membrane, examining their roles, their diversity, and how they work together to make a secure boundary around the cell.
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Khan Academy: Osmosis and Tonicity
Provides an overview of osmosis and tonicity and looks at how osmosis works, as well as the role it plays in the water balance of cells. Describes hypertonic, isotonic, and hypotonic solutions and their effect on cells.
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Khan Academy: Diffusion and Passive Transport
Learn about membrane permeability and facilitated diffusion (including channels and carrier proteins).
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Khan Academy: Active Transport
Learn about gradients of molecules that exist across cell membranes, how they can help or hinder transport, and how active transport mechanisms allow molecules to move against their gradients.
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Khan Academy: Bulk Transport
Article looks at the different modes of bulk transport: phagocytosis, pinocytosis, receptor-mediated endocytosis, and exocytosis.
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Khan Academy: Introduction to Cellular Respiration and Redox
Introduction to redox in cellular respiration. Provides an overview of how cells break down fuels and looks at some of the electron transfer reactions that are key to this process.
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Khan Academy: Steps of Cellular Respiration
Resource walks you through the four major stages of cellular respiration which include glycolysis, pyruvate oxidation, the citric acid or Krebs cycle, and oxidative phosphorylation and traces how they connect up to one another.
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Khan Academy: Glycolysis
Provides an overview of glycolysis which is the first step in the breakdown of glucose to extract energy for cellular metabolism. The article discusses in detail its two main phases: the energy-requiring phase and the energy-releasing...
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Khan Academy: The Citric Acid Cycle
Resource provides an overview of the steps of the citric acid cycle, also known as the Krebs cycle or tricarboxylic acid (TCA) cycle. Gives detailed examples of how this amazing cycle works and discusses the products of the cycle.
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Khan Academy: Oxidative Phosphorylation
Article presents an in-depth overview of oxidative phosphorylation which provides most of the ready chemical energy (ATP) used by the cells in your body.