Lecture 9_Energetics_iClicker

During cellular respira3on during cellular respiraon

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Unformatted text preview: transfer electrons between reactants are called oxida<on- reduc<on reac<ons, or redox reac.ons •  In oxida.on, a substance loses electrons, or is oxidized •  In reduc.on, a substance gains electrons, or is reduced (the amount of posi<ve charge is reduced) becomes oxidized (loses electron) becomes reduced (gains electron) •  The electron donor is called the reducing agent •  The electron receptor is called the oxidizing agent •  Some redox reac<ons do not transfer electrons but change the electron sharing in covalent bonds •  An example is the reac<on between methane and O2 Reactants Products becomes oxidized becomes reduced Methane (reducing agent) Oxygen (oxidizing agent) Carbon dioxide Water Oxida3on of Organic Fuel Molecules During Cellular Respira3on •  During cellular respira<on, the fuel (such as glucose) is oxidized, and O2 is reduced: becomes oxidized becomes reduced Stepwise Energy Harvest via NAD+ and the Electron Transport Chain •  In cellular respira.on, glucose and other organic molecules are broken down in a series of steps •  Electrons from organic compounds a...
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This document was uploaded on 03/06/2013.

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