Ch_07 - Vital Harvest Deriving Energy from Food Energy...

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Vital Harvest Deriving Energy from Food Energy Currency and Energy Carrier Molecules Energy harvesting Everest s deadly problem: having only 30 percent of the oxygen that would be available in the atmosphere at sea level. How many people know why we need to breathe oxygen? To extract energy from food (covered in this lecture). Does all energy harvesting require oxygen? Relevant questions to be answered. How do cells convert food into energy? Do they convert fats differently from carbohydrates? Do you get fat by eating fat or calories? Why do we need to breathe? How does exercise affect metabolism? What about energy supplements? What does it mean to have a fast or slow metabolism? Energy Currency and Energy Carrier Molecules ATP is the most important energy storage molecule. Potential energy from food breakdown is used to drive the endergonic synthesis of ATP (like recharging a battery). The charged ATP has energy that can be released at any time (by breaking off the third phosphate to do a variety of actions). Energy Currency and Energy Carrier Molecules Electrons from food carry energy to make ATP. Electrons from glucose run downhill. Transferred by carriers, the electron drop powers uphill synthesis of ATP. Electron transfers to molecules—redox reactions occur side by side. One molecule is oxidized—loses electrons.
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Another molecule is reduced—gains those electrons (reduces charge). Energy Currency and Energy Carrier Molecules Intermediate electron carriers serve to shuttle electrons through these reactions, transferring energy as they go. NAD + (empty city cab) in redox reaction is an oxidizing agent (removes electrons causing a substance to be oxidized); it accepts a hydrogen atom and one electron becomes NADH (full cab). NADH can carry electrons (proceed down energy hill) on to
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This note was uploaded on 02/25/2012 for the course BIO 1421 taught by Professor Farr during the Fall '08 term at Texas State.

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Ch_07 - Vital Harvest Deriving Energy from Food Energy...

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