Bio 20 Review Exam 3

Bio 20 Review Exam 3 - 1. Know that exergonic reactions...

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1. Know that exergonic reactions create a product that has less potential energy than the substrate (reactant). (Chemical Reactions Either Release or Store Energy) pg 82 a. Exergonic reaction: An energy-releasing chemical reaction in which the reactants contain more potential energy than the products. The reaction releases an amount of energy equal to the difference in potential energy between the reactants and the products. (Exergonic reactions proceed spontaneously)(exergonic reactions increase the temperature) b. Endergonic reaction: An energy-requiring chemical reaction , which yields products with more potential energy than the reactants. The amount of energy stored in the products equals the difference between the potential energy in the reactants and that in the products. (Endergonic reactions do not proceed spontaneously) (Endergonic reactions decrease the temperature) 2. Understand that ATP generally energizes cellular process by directly transferring phosphates to other molecules. a. Phosphorylation: The transfer of a phosphate group, usually from ATP, to a molecule. Nearly all cellular work depends on ATP energizing other molecules by phosphorylation. 3. Know that ATP possesses between 7.1 and 7.3 kcal/mole of energy and that glucose possesses 686 kcal/mole of energy (know for calculation). 4. Remember that exergonic reactions increase the temperature and endergonic reactions decrease the temperature (because they are pulling energy in). 5. Know that if a scientist or student adds a catalyst (enzyme) to a reaction that the rate of the reaction will speed up. (Enzymes Speed Up The Cell’s Chemical Reactions By Lowering Energy Barriers) pg 84 a. Energy of Activation (Ea): The amount of energy needed to push the reactants over an energy barrier, or “hill” so that the “downhill” part of the reaction can begin. b.
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This note was uploaded on 03/19/2012 for the course BIO 20 taught by Professor Zane during the Fall '10 term at Saddleback.

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Bio 20 Review Exam 3 - 1. Know that exergonic reactions...

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