Biology 311C Lecture 21

Biology 311C Lecture 21 - • Oxygen gains the electrons...

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October 14, 2011 Biology 311C Lecture 21 The organic molecules from plants are stuff we can extract and use. Lipids, carbohydrates, and proteins can be broken down to make ATP and energy. Glucose has a lot of energy stored in it which means we cannot release it all at once. If our cells try to harness all of it in just one reaction, our cells would blow up. Glycolysis is happening in the cytosol. The carefully regulated transfer of electrons during cellular respiration gently releases energy stored in organic molecules. In oxidation, a substance loses electrons, or is oxidized. During cellular respiration, glucose is oxidized and O 2 is reduced. It loses electrons.
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Unformatted text preview: • Oxygen gains the electrons because it is highly electronegative. • Electron carriers are dinucleotides that come from B vitamins in diet. It becomes NADH. • NADH then carries the electrons to the electron transport chain. It then starts all over again. • The process of cellular respiration there is an energy investment stage that gets the electrons ready to be stripped off. • NAD+ is the oxidized form. It has dropped off its electrons. • NADH contains more free energy. It carries the electrons that will be stripped and be used to do work. • As the electrons fall gently down, there is a controlled release of energy for synthesis of ATP....
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This note was uploaded on 02/21/2012 for the course BIO 311 C taught by Professor Mcclelland during the Fall '09 term at University of Texas.

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