Which of the following statements is/are true of enzyme catalysts?Group of answer choicesThey bind to substrates but are never covalently attached to substrate or product.They increase the equilibrium constant for a reaction, thus favoring product formation.They increase the rate at which substrate is converted into product.They lower the activation energy for the conversion of substrate to product.To be effective, they must be present at the same concentration as their substrates.

All of the following are true of enzyme-catalyzed reactions EXCEPT:A.the presence or absence of a post-translational modification may alter the activation energy Ea of the reaction.B.the enzyme does not affect the net reaction rate if the ratio of products to reactants equals Keq for the reaction.C.substrates can covalently modify the enzyme to cause a permanent decrease in the enzyme's turnover number kcat.D.the saturation of enzyme active sites by substrate molecules limits the maximum reaction velocity Vmax.Submit

Which of the following is NOT TRUE of enzymes?Group of answer choicesall enzymes are proteinsenzymes are changed in the reaction they performenzymes catalyze metabolic reactionsenzymes work on substratesenzymes lower activation energy of reactions

Which of the following statements are true of enzymes?SELECT ALL THAT APPLYEnzymes are permanently changed in a reaction.Enzymes are involved in catabolism but not in anabolism.Enzymes produce specific products from specific substrates.Enzymes provide a route from reactants to products that has a lower activation energy.Enzymes can be regulated to control cellular metabolism.All enzymes require cofactors for activity.

How do enzymes affect the rate of reactions?Enzymes decrease the rate of reaction via the binding of substrates to the enzyme active site.Enzymes increase the rate of reaction without being used up. This is achieved by the binding of substrate to the enzyme active site, where the reaction is catalysed.Enzymes decrease the rate of reaction via the binding of substrates to the enzyme active sites. Enzymes act as reactants.Enzymes increase the rate of reaction via the binding of substrates to the enzyme active sites. Enzymes act as reactants.I DON'T KNOWSUBMIT ANSWER

A catalyst is added to a reaction. Which of the following statements best describes the effect that a catalyst has on a reaction? Group of answer choicesThe catalyst gives the reactants more kinetic energyThe reaction rate is decreasedThe activation energy of the reaction is increasedThe activation energy of the reaction is decreased