Study Guide for Campbell Biology
11th Edition
ISBN: 9780134443775
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece, Martha R. Taylor, Michael A. Pollock
Publisher: PEARSON
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Chapter 8, Problem 11TYK
In an experiment, changing the pH from 7 to 6 resulted in an increase in product formation. From this we could conclude that
- a. the enzyme’s optimal pH is 6.
- b. this enzyme works best at a neutral pH.
- c. the temperature must have increased when the pH was changed to 6.
- d. the enzyme was in a more active shape at pH 6.
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Students have asked these similar questions
Catalase, when in contact, only create bubble with hydrogen peroxide and not with water. This would mean that*
A. water needs an activator for the enzyme to function.
B. the pH of the water is not the optimum pH for catalase.
C. the enzyme catalase is specific with hydrogen peroxide.
D. water is less harmful to catalase than hydrogen peroxide.
Based on the image attached, what can be concluded from the graph of enzyme activity?
A. No enzyme activity recorded at pH 5.0
B. Optimum pH for enzyme activity between pH 5.0 to 5.8
C. The optimum pH for the enzyme is 6.6
D. Decreasing of enzyme activity due to inhibitor
Which of the following best explains why enzyme catalysis is affected by a change in pH?
A. Change in pH alters ionization states of serine in the active site involved in nucleophilic catalysis
B. The ionization states of his, asp and glu involved in acid/base catalysis are altered with change in pH
C. Change in pH alters ionization states of contact amino acids in the active site
D. All enzymes have optimum pH
Chapter 8 Solutions
Study Guide for Campbell Biology
Ch. 8 - Complete the following concept map that summarizes...Ch. 8 - Complete the following table to indicate how the...Ch. 8 - Develop a concept map on free energy and G. The...Ch. 8 - Prob. 4IQCh. 8 - Prob. 5IQCh. 8 - In the following graph of an exergonic reaction...Ch. 8 - In the following diagram of a catalytic cycle,...Ch. 8 - Return to the diagram in Interactive Question 3.7,...Ch. 8 - Both ATP and ADP serve as regulators of enzyme...Ch. 8 - What is the relationship between the concept of...
Ch. 8 - What role do enzymes play in metabolism?Ch. 8 - ________ the totality of an organisms chemical...Ch. 8 - _______ pathways that use energy to synthesize...Ch. 8 - Prob. 3TYKFCh. 8 - _______ the most random form of energyCh. 8 - _______ term for the measure of disorder or...Ch. 8 - Prob. 6TYKFCh. 8 - _______ inhibitors that decrease an enzymes...Ch. 8 - Prob. 8TYKFCh. 8 - Prob. 9TYKFCh. 8 - Prob. 10TYKFCh. 8 - Catabolic and anabolic pathways are often coupled...Ch. 8 - Which statement most closely reflects the first...Ch. 8 - When a cell breaks down glucose, only about 34% of...Ch. 8 - Prob. 4TYKCh. 8 - Prob. 5TYKCh. 8 - Prob. 6TYKCh. 8 - One way in which a cell maintains metabolic...Ch. 8 - Prob. 8TYKCh. 8 - Prob. 9TYKCh. 8 - What is meant by an induced fit? a. The binding of...Ch. 8 - In an experiment, changing the pH from 7 to 6...Ch. 8 - Prob. 12TYKCh. 8 - Penicillin binds to the active site of an enzyme...Ch. 8 - Prob. 14TYKCh. 8 - Prob. 15TYKCh. 8 - Which line in the diagram indicates the G of the...Ch. 8 - Prob. 17TYKCh. 8 - Prob. 18TYKCh. 8 - Prob. 19TYKCh. 8 - Prob. 20TYK
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- What is the reason why the transition state of a catalyzed reaction is lower has lower energy compared to an uncatalyzed reaction? A. because enzymes only work at low temperatures B. because of favorable interactions with the substrate C. because of enthalpic interactions between the enzyme and the transition state D. A and Barrow_forwardYou 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.arrow_forwardThe important amino acid residues in the active site of enzyme X were found to be aspartic acid and lysine. In an experiment, the pH of the buffer solution in which enzyme X was dissolved was changed from pH 7 to pH 5. What would be the expected effect of this change on the enzyme’s catalytic activity? A. decrease B. increase C. unchanged D. cannot be determinedarrow_forward
- Which of the following statements about the Michaelis Menten constant (Km) is correct......A. can be determined by plotting the data v/[S] against 1/[S] B. A large Km indicates a low affinity between the enzyme and the substrate C. A large Km means that a large concentration of substrate is needed for the enzyme to work D. is a measure of the affinity of enzymes for proteins, minerals and vitamins E. Small Km means that a large concentration of substrate is needed for the enzyme to workarrow_forwardWhen an enzyme catalyzes a reaction… A. The pH changes B. Substrate concentration is reduced C. Product concentration is reduced D. Substrate concentration is increasedarrow_forwardWhich of the following analogies best describes the induced-fit model of enzyme-substrate binding? a. a hug between two people b. a key fitting into a lock c. a square peg fitting through the square hole and a round peg fitting through the round hole of a children’s toy d. the fitting together of two jigsaw puzzle piecesarrow_forward
- Which one of the following statements is true of enzyme catalysts? a. Their catalytic activity is independent of pH. b. They are generally equally active on D and L isomers of a given substrate. c. They can increase the equilibrium constant for a given reaction by a thousand fold or more. d. They can increase the reaction rate for a given reaction by a thousand fold or more. e. To be effective, they must be present at the same concentration as their substrate.arrow_forwardWhich of the following accurately describes how an enzyme functions? a. reduces the energy content of the products b. allows for the exothermic reaction of materials that are usually endothermic c. changes the reaction mechanism effectively reducing the activation energy d. shifts the equilibrium for the reactionarrow_forwardIn a highly high-temperature environment, you placed an enzyme and some substrates. You've seen that there hasn't been any reaction. Applying what you have learned on enzyme activity, how would you explain what occurred? A. The enzyme was not placed at a pH level that would allow it to react at its maximum rate. B. There are not enough enzymes for the reaction to occur. C. The enzyme may have denatured or broken down due to the high temperature of the environment, resulting in no reaction. D. There are not enough substrates for reaction to occur. Substrate concentration affects enzyme activity. Determine what would occur when there are too many substrates and fewer enzymes? A. No enzyme activity would occur. B. The reaction rate would continuously increase. C. The reaction would speed up tremendously. D. Maximal rate of reaction would occur. Enzyme activity mainly involves the active site and the substrate. How would you compare the active site from the substrate? A. The substrate…arrow_forward
- Which of the following will happen if the concentration of an enzyme increases for a given substrate?? a. the reaction rate increases similarly b. the rate of the reaction decreases to a point. c. there is no change in the reaction. d. the turnover number decreases at the same rate that the enzyme concentration increases. e. the reaction stops.arrow_forwardIf the environmental temperature gets too high, what will happen to an enzyme and the chemical reaction it catalyzes? Group of answer choices A. It will not encounter its substrates often, and the reaction will slow down. B. It will crystallize, the active site will become inflexible and slow down the reaction. C. It will denature, lose its shape, and the reaction will not occur. D. It will become less fluid, and be unable to transport substances easily. E. It will become more fluid, and speed up the reaction.arrow_forwardYou have a reaction that takes 8 hours to reach completion at 20 degrees celcius. What is the likely result of changing the temperature to 30 degrees celcius? a. the reaction should take less times b. reaction time would be unaffected c. the reaction should take more time Which would be the correct answer to this question?arrow_forward
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