Photosynthesis (Khan Academy)

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There’s a lot of carbon in your body – in DNA, proteins, carbohydrates, fats, and other key biological molecules. How did that carbon get there? Drumroll… photosynthesis! Learn how plants and other photosynthetic organisms use light energy to make sugars from carbon dioxide and water, bringing both chemical energy and readily usable carbon into Earth’s […]

Cellular respiration (Khan Academy)

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How do your cells extract energy from the food that you eat? As it turns out, cells have a network of elegant metabolic pathways dedicated to just this task. Learn more about cellular respiration, fermentation, and other processes that extract energy from fuel molecules like glucose. (1) Introduction to cellular respiration ATP: Adenosine triphosphate ATP […]

Membranes and transport (Khan Academy)

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How do the cells in your body define their boundaries (and control what comes in or goes out)? As it turns out, cells have a sophisticated and flexible barrier, the plasma membrane, and a wide array of strategies for transporting molecules in and out. Learn more about what the membrane’s made of and how different […]

Structure of a cell (Khan Academy)

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You, my friend, are made up of cells. Lots and lots of them. Some of them are eukaryotic (human), but many more of them are prokaryotic, thanks to the friendly bacteria of your gut, skin, and other body systems. Jump in to learn more about prokaryotic and eukaryotic cells and the complex and beautiful structures […]

Energy and enzymes (Khan Academy)

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You, like other living systems, are an amazing energy transformer. As you move your eyes to read these words, your body is busily converting chemical energy from your lunch into kinetic energy and thermal energy (heat). Learn more about how biological energy transfers work, as well as how protein machines called enzymes direct metabolic traffic […]

Macromolecules (Khan Academy)

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There’s an old saying, “You are what you eat.” In some senses, this is literally true! When we eat food, we take in the large biological molecules found in the food, including carbohydrates, proteins, lipids (such as fats), and nucleic acids (such as DNA), and use them to power our cells and build our bodies. […]

Properties of carbon (Khan Academy)

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Did you know that your body is approximately 18% carbon? Learn more about carbon and why it makes a great building block for biological molecules. We’ll look at the bonding properties of carbon, the structures of hydrocarbons, different types of isomerism, and some functional groups important in biology. (1) Carbon Carbon as a building block […]

Water, acids, and bases (Khan Academy)

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Where would we be without water? Well, we probably wouldn’t exist at all! Learn more about this fascinating molecule: its hydrogen bonds, its properties, and why it’s a key ingredient for biological systems of all sizes. Plus, brush up on the acid-base chemistry that takes place in water (and learn how it works in your […]

Chemistry of life (Khan Academy)

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Learn how chemistry makes life possible! From you, to your dog, to your dinner, to the global ecosystem, all living systems are made out of atoms that obey the basic rules of chemistry. Here, you can learn about the key properties of atoms, including what particles they contain, how they are organized, and how they […]

Studying for the AP Biology exam? (Khan Academy)

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Review for the AP Biology exam by working through practice problems with Sal! (1) Free-response questions: 2015 AP Biology exam 2015 AP Biology free response, 1a-c 2015 AP Biology free response, 1d-e 2015 AP Biology free response, 2a-b 2015 AP Biology free response, 2c-d 2015 AP Biology free response 3 2015 AP Biology free response […]