11. Which of the following statements is true about enzyme-catalyzed reactions?
ID: 218379 • Letter: 1
Question
11. Which of the following statements is true about enzyme-catalyzed reactions? The reaction is faster than the same reaction in the absence of the enzyme a. The free energy change of the reaction is opposite from the reaction that occurs in the absence of the enzyme. b. The reaction always goes in the direction toward chemical equilibrium. c. d. Enzyme-catalyzed reactions require energy to activate the enzyme e. Enzyme-catalyzed reactions release more free energy than noncatalyzed reactions 12. Which of the following statements regarding enzymes is true? a. Enzymes increase the rate of a reaction by making the reaction more exergonic b. Enzymes increase the rate of a reaction by lowering the activation energy barrier. c. Enzymes increase the rate of a reaction by reducing the rate of reverse reactions. d. Enzymes change the equilibrium point of the reactions they catalyze. e. Enzymes make the rate of a reaction independent of substrate concentrations. 13. The mechanism in which the end product of a metabolic pathway inhibits an earlier step in the pathway is most precisely described as a. metabolic inhibition. b. feedback inhibition. c. allosteric inhibition. d. noncooperative inhibition. e. reversible inhibition. 14.Zinc, an essential trace element for most organisms, is present in the active site of the enzyme carboxypeptidase. The zinc most likely functions as a(n) a. competitive inhibitor of the enzyme. b. noncompetitive inhibitor of the enzyme. c. allosteric activator of the enzyme. d. cofactor necessary for enzyme activity. e. coenzyme derived from a vitamin. 15. The oxygen consumed during cellular respiration is involved directly in which process or event? a. glycolysis b. accepting electrons at the end of the electron transport chain c. the citric acid cycle d. the oxidation of pyruvate to acetyl CoA e. the phosphorylation of ADP to form ATPExplanation / Answer
AS PER CHEGG POLICY, PROCEEDING TO ANSWER ONLY THE FIRST 4 QUESTIONS / SUBQUESTIONS / PARTS / SUBPARTS, THAT IS, QUESTIONS 11 TO 14, UNLESS SPECIFIED OTHERWISE BY THE QUESTION UPLOADER:
ANSWER 11.
a. The reaction is faster than the same reaction in the absence of the enzyme - this is because enzymes are referred to as catalysts and they circumvent the time-limiting activation step by making the Enzyme-Substrate complex more energetically favourable.
ANSWER 12.
b. Enzymes increase the rate of a reaction by lowering the activation energy barrier - this is because the Enzyme-Substrate complex formed is more energetically favourable and allows the reaction to proceed to the products side in a faster manner.
ANSWER 13.
b. Feedback Inhibition - this is because the products formed are a key regulator of their own synthesis pathway.
ANSWER 14.
d. Cofactor necessary for enzyme activity - this is because the cofactor produces certain key conformational changes within the enzyme necessary for its activity.
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