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ATP cycle and reaction coupling | Energy (article) | Khan Academy ATP, the charged battery, has energy that can be used to power cellular reactions Once the energy has been used up, the uncharged battery (ADP) must be recharged before it can again be used as a power source
Oxidative phosphorylation | Biology (article) | Khan Academy Overview of oxidative phosphorylation The electron transport chain forms a proton gradient across the inner mitochondrial membrane, which drives the synthesis of ATP via chemiosmosis
The Calvin cycle (article) | Photosynthesis | Khan Academy The ATP and NADPH used in these steps are both products of the light-dependent reactions (the first stage of photosynthesis) That is, the chemical energy of ATP and the reducing power of NADPH, both of which are generated using light energy, keep the Calvin cycle running
Steps of cellular respiration | Biology (article) | Khan Academy To see how a glucose molecule is converted into carbon dioxide and how its energy is harvested as ATP and NADH FADH 2 in one of your body's cells, let’s walk step by step through the four stages of cellular respiration
ATP: Adenosine triphosphate (video) | Khan Academy Energy is stored when ATP is formed and released when it's broken down into ADP (Adenosine Diphosphate) and a phosphate group This energy release powers various biological processes
The citric acid cycle - Khan Academy The reduced electron carriers— NADH and FADH 2 —generated in the TCA cycle will pass their electrons into the electron transport chain and, through oxidative phosphorylation, will generate most of the ATP produced in cellular respiration Below, we’ll look in more detail at how this remarkable cycle works
Glycolysis | Cellular respiration | Biology (article) | Khan Academy At the end of glycolysis, we’re left with two ATP , two NADH , and two pyruvate molecules If oxygen is available, the pyruvate can be broken down (oxidized) all the way to carbon dioxide in cellular respiration, making many molecules of ATP
Cellular respiration introduction | Biology (video) | Khan Academy The chemical reaction for cellular respiration involves glucose and oxygen as inputs, and produces carbon dioxide, water, and energy (ATP) as outputs There are three stages to cellular respiration: glycolysis, the Krebs cycle, and the electron transport chain
Overview of cellular respiration (video) | Khan Academy The Krebs cycle occurs in the mitochondrial matrix, where pyruvate is turned into acetyl-CoA, which then goes through a series of reactions, producing ATP, NADH, and FADH2 Finally, oxidative phosphorylation uses NADH and FADH2 to create a proton gradient, which helps make more ATP