Enzymes are able to speed up a reaction by lowering the activation energy:Question 59 Answer Choices   A.  only if the reaction is exergonic.   B.  only if the reaction is endergonic.   C.  if the reaction is endergonic or exergonic   D.  if ΔG is positive.

How do enzymes speed up the rate at which a biological reaction occurs?Group of answer choicesBy increasing the energy of the reactant molecules.By increasing the total amount of energy released by the reaction.By decreasing the amount of energy needed to proceed through the reaction.By increasing the energy of the product molecules.By making the reaction release energy rather than requiring energy.

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 correctly describes how enzymes lower the activation energy of a biochemical reaction?Question 8Answera.Enzymes increase the temperature of the reaction, providing more energy to the reactants.b.Enzymes stabilize the transition state, reducing the energy required to reach it.c.Enzymes alter the equilibrium constant of the reaction, favoring product formation.d.Enzymes are consumed in the reaction and must be continually replaced.

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

A reaction that has a higher energy of activation will proceed ____________ than one with a lower energy of activation.Select answer from the options belowfasterat equivalent speedslowerthere is not enough information providedSave for LaterSubmit Answer