6 good questions and answers: "Microbial Metabolism - Catalysis and enzymes"

What is needed to reduce the activation energy barrier, allowing the reaction to proceed?
Catalyst
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What are the major catalysts in cells?
Enzymes
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What is the name of the group consisting of small nonprotein molecules that bind tightly to their enzymes, usually covalently and permanently?
Prosthetic group
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What is the name of the group consisting of small nonprotein molecules that bind loosely and often transiently bound to enzymes; thus, it can associate with a number of different enzymes?
Coenzymes
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How is the required activation energy reduced by an enzyme-substrate complex?
By placing strain on specific bonds
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Are enzymes reversible in their activity?
Yes, but enzymes that catlayze highly exergonic or highly endergonic reactions typically function in only one direction.
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