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Enzymes Biochemistry Questions and Answers

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Enzymes Correct Answer important biological catalysts Key features: Lower activation energy Increase rate of reaction (kinetics) Do not alter equilibrium constant Are not changed or consumed i ... n the reaction (appear in both reactants and products) --> far fewer enzymes are required relative to overall amount of substrate because one enzyme can act on many molecules of substrate over time Are ph- and temperature sensitive, with optimal activity at specific ph ranges and temperatures Do not affect overall delta G of reaction Are specific for a particular reaction or class of reactions Catalysts Correct Answer do not impact thermodynamics of biological reaction. The deltah(rxn) and equilibrium position do not change. Help reaction proceed at much faster rate Enzyme specificity Correct Answer enzymes are picky Molecules upon which enzyme act are called substrates. A given enzyme will only catalyze a single reaction or class of reactions with these substrates. Oxidoreductases Correct Answer catalyze oxidation-reduction reactions. The transfer of electrons between biological molecules. Often have a cofactor that acts as electron carrier (i.e. NAD+ and NADP+) Enzymes with dehydrogenase or reductase - oxidoreductasess. Enzymes in which oxygen is final electron acceptor often include oxidase in their names Electron donor - reductant Electron acceptor - oxidant Reductant Correct Answer electron donor in reactions catalyzed by oxidoreductases Oxidant Correct Answer electron acceptor in reactions catalyzed by oxidoreductases [Show More]

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