Concept 6 - Concept 6.4 Enzymes speed up metabolic...

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Concept 6.4 Enzymes speed up metabolic reactions by lowering energy barriers Spontaneous chemical reactions may occur so slowly as to be imperceptible. The hydrolysis of table sugar (sucrose) to glucose and fructose is exergonic. G = −7 kcal/mol Despite this, your sugar sits in its bowl with no observable hydrolysis. If we add a small amount of the enzyme catalyst sucrase to a solution of sugar, all the  sucrose will be hydrolyzed within seconds. catalyst  is a chemical agent that speeds up the rate of a reaction without being  consumed by the reaction. An  enzyme  is a catalytic protein. Enzymes regulate metabolic pathways. Every chemical reaction involves bond breaking and bond forming. To hydrolyze sucrose, the bond between glucose and fructose must be broken and new bonds  must form with hydrogen and hydroxyl ions from water. To reach a state where bonds can break and reform, reactant molecules must absorb energy 
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This note was uploaded on 01/04/2012 for the course BSC BSC1005 taught by Professor Orlando,rebecca during the Fall '10 term at Broward College.

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Concept 6 - Concept 6.4 Enzymes speed up metabolic...

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