![]() Redox reactions involve either losing or gaining electrons. Redox reactions (as they're known) are responsible for many of the changes that occur during cellular respiration. To follow along during our behind-the-scenes tour of cellular respiration, it helps to be familiar with oxidation and reduction reactions. That is a pretty good payout for one molecule of glucose.Ĭellular respiration takes place in three steps: The end product of cellular respiration is exactly 38 molecules of ATP. ATP is often called the energy currency of the cell. Instead of Red Bull or Monster Energy, cellular energy takes the form of a compound called ATP (short for adenosine triphosphate). The purpose of cellular respiration is to make usable energy for the cell. Chemical energy is boss when it comes to getting things done: it powers every process needed for life.Ĭellular respiration is also called aerobic respiration because it takes place when oxygen is present. Metabolism is the way we get to the good stuff, the chemical energy, in the molecules of the food we eat. The point is we all have to eat.īut energy and food are not the same thing when we're discussing the cellular level. And plants sunbathe, make their own food, and then chow down. ![]() Some creepy crawlies get their energy from eating dirt, which is probably not the tastiest meal on the planet. Humans like to sit down to three square meals a day (even if they are on round plates), but other living things have drastically different ways of dealing with their energy needs. The process of using the energy in sunlight to make food (glucose).Metabolism and Respiration Overview Metabolism Is Just One Big ReductionĪll organisms need energy to live. The final product of the Calvin cycle is glucose.The Calvin cycle reactions use chemical energy from NADPH and ATP that were produced in the light reactions. ![]() The reactions of the Calvin cycle add carbon (from carbon dioxide in the atmosphere) to a simple five-carbon molecule called RuBP.The light reactions also release oxygen gas as a waste product.The light reactions capture energy from sunlight, which they change to chemical energy that is stored in molecules of NADPH and ATP.Electron carrier molecules are arranged in electron transport chains that produce ATP and NADPH, which temporarily store chemical energy.The light reactions of photosynthesis occur in the thylakoid membranes of the chloroplast.Photosynthesis occurs in the chloroplast, an organelle specific to plant cells.Most autotrophs make their "food" through photosynthesis using the energy of the sun. Autotrophs store chemical energy in carbohydrate food molecules they build themselves.6CO 2 + 6H 2O + Light Energy → C 6H 12O 6 + 6O 2.The following 10 points summarize photosynthesis. Obviously, much more details could have been included, though those are beyond the scope of these concepts. In the five concepts describing photosynthesis, this process has been presented in an introductory fashion. As you have seen, photosynthesis includes many steps all conveniently condensed into one simple equation. Is it really as simple as that? Of course not. ![]() The process of using the energy in sunlight to make food (glucose).
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