CHAPTER 8-Enzymes

CHAPTER 8-Enzymes - CHAPTER 8 Properties of Enzymes pp...

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CHAPTER 8 Properties of Enzymes pp 150-157
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CATALYTIC ACTIVITY Catalyst A catalyst is a chemical agent that speeds up a reaction without being consumed by the reaction. An enzyme is a protein with catalytic activity. Enzymes lower the energy of activation of biological chemical reactions.
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ACTIVATION ENERGY All chemical reactions between molecules involve the making or breaking of bonds. Reactant molecules must absorb energy from their surroundings in order for bonds to change. The activation energy of a reaction is the initial amount of energy required to get the reaction started. Activation energy is usually in the form of heat for a spontaneous (uncatalyzed) reaction.
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The use of heat to overcome the activation energy is inappropriate for biological systems for two reasons: 1. High temperatures denature proteins and kills cells. 2. Heat would speed up all reactions not just the ones needed at a particular time.
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This note was uploaded on 03/30/2012 for the course BI 107 taught by Professor Fuller during the Fall '08 term at Montgomery College.

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CHAPTER 8-Enzymes - CHAPTER 8 Properties of Enzymes pp...

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