Which of these statements concerning enzymes is correct? a. Enzymes increase the rate of reactions but are permanently changed as a result. b. Enzymes are proteins that function as catalysts. c. Enzymes increase the activation energy requirement for a reaction to occur. d. Enzymes usually can only double the rate of a chemical reaction. e. Enzymes increase the kinetic energy of the reactants.

Which of these statements concerning enzymes is correct? a. Enzymes increase the rate of reactions but are permanently changed as a result. b. Enzymes are proteins that function as catalysts. c. Enzymes increase the activation energy requirement for a reaction to occur. d. Enzymes usually can only double the rate of a chemical reaction. e. Enzymes increase the kinetic energy of the reactants.

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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½ O₂ + 2H+ +2 e → H₂O FAD + 2H+ + 2e → FADH₂ E'º = 0.816V E'º = -0.219V Calculate the AG" of the following reaction: FAD + H₂O → FADH₂ + 1/2 0₂. A. -200 kJ/mol B. -100 kJ/mol C. 50 kJ/mol D. 100 kJ/mol E. 200 kJ/mol
A histidine was determined to be the critical residue involved in an enzyme-catalyzed reaction. If the pKa of the histidine is known to be 6.5 in the active site and the pH of maximum catalytic activity is 7.2, what is likely the primary role of histidine in the catalytic reaction? A. forms a covalent bond with the substrate B. reduces the entropy of the substrate C. stabilizes a charged intermediate D. acts as a proton donor Aspartate and lysine are in the active site of an enzyme. They are both known to participate directly in catalysis. The pKa's of the residues are found to be 3.2 and 9.6, respectively for aspartate and lysine. The optimum pH for the enzyme is 6.4. Which forms of these two residues will predominate when the enzyme is most active? A. aspartate is protonated; lysine is deprotonated B. both residues are deprotonated C. aspartate is deprotonated; lysine is protonated D. both residues are protonated
Which of the following statements concerning enzymes is TRUE? a. Enzymes can increase the equilibrium constant of a reaction by 1000-fold. b. The activity of many enzymes can be regulated. c. Many enzymes are consumed in the reactions they catalyze. d. The rate of enzymatic catalysis is independent of pH.
Which of the following statements is not true about enzymes?* A. Enzymes are biological catalysts B. Enzymes as catalysts lowers the activation energy thus, speeds up the rate of reaction C. Enzymes are proteins D. Enzymes are highly specific E. None of the given options
You are performing an enzyme kinetics experiment testing the effect of pH on reaction rate. You accidentally one of the tubes to react two minutes longer than the other samples. How would this affect the interpretation of the data you obtain for that one tube? A. No change in the interpretation of your data B. Your data would represent an underestimate of the enzyme's activity at that one pH. Your data would represent an overestimate of your enzyme's activity at that one pH. D. All of the data would be invalid.
You are investigating a specific compound known to inhibit the activity of an enzyme. You hypothesize that the compound is a competitive inhibitor of the enzyme’s activity. To test your hypothesis, you design an experiment where you add increasing amounts of the enzyme’s substrate to a solution containing the enzyme, and then you test the reaction rate. Create a graph that represents the predicted results of the experiment, based on your hypothesis, and explain the choice.
A biologist investigating enzyme function plotted the activity of a particular enzyme (y-axis) vs pH (x-axis). Experiment A was performed at 30 oC, experiment B at 10 oC and experiment C at 100 oC. Experiments A, B, and C all used the same type of enzyme, they simple tested the enzyme's activity at different temperatures. Using your knowledge of enzyme activity, answer the questions based on the results shown in the graph. (Answer questions A) Graph included A. Explain why A and B are so different.
Which of the following enzyme classes catalyze reactions in which two molecules become covalently linked to each other? A. Kinase B. Hydrolase C. Isomerase D. Ligase
Which of the following is NOT true about enzymes A. they do not alter reaction equilibria B. they accelerate the forward rate of a reaction C. they decrease ∆G’0 of a reaction D. they accelerate the reverse rate of a reaction E. they stabilize transition states
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A chemical reaction is more likely to occur spontaneously if A. the products of the reaction are more complex than the reactants. B. the system takes up heat from its surroundings. C. the products of the reaction are more disordered than the reactants. D. the system gains free energy.