Microbiology: An Introduction
12th Edition
ISBN: 9780321929150
Author: Gerard J. Tortora, Berdell R. Funke, Christine L. Case
Publisher: PEARSON
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Chapter 5, Problem 3R
DRAW IT An enzyme and substrate are combined. The
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Below is data collected from an experiment that examined the activity of Enzyme A at three
different temperatures. The amount of product formation was measured in mg/min.
Cold Enzyme
Room Temp Enzyme
Boiled Enzyme
3 mg/min
10 mg/min
A mg/min
Based on the above results:
What is the optimal environment for this enzyme?
Describe in detail what most likely happened to the enzyme in the boiled temperature.
An experiment on enzyme-catalyzed reaction was conducted in the laboratory by a student. Results
obtained are summarized in the table below.
In all the experiments, the concentration of the enzyme is the same.
Substrate Concentration
Velocity
(pmol/min)
(pmol)
1.5
0.21
3
0.28
4
0.32
0.36
8
0.4
15
0.45
18
0.47
1. Plot or graph these results using the Lineweaver-Burk method.
2. Determine the KM and Vmax values. Show all equations and calculations.
The diagram shows the mechanism of a general enzyme‑catalyzed reaction. Put the labels in the correct locations.
The abbreviations E, P and S indicate the enzyme, product, and substrate, respectively.
Chapter 5 Solutions
Microbiology: An Introduction
Ch. 5 - Prob. 1RCh. 5 - DRAW ITUsing the diagrams below, show each of the...Ch. 5 - DRAW IT An enzyme and substrate are combined. The...Ch. 5 - Define oxidation-reduction, and differentiate the...Ch. 5 - There are three mechanisms for the phosphorylation...Ch. 5 - All of the energy-producing biochemical reactions...Ch. 5 - Fill in the following table with the carbon source...Ch. 5 - Write your own definition of the chemiosmotic...Ch. 5 - Why must NADH be reoxidized? How does this happen...Ch. 5 - NAME IT What nutritional type is a colorless...
Ch. 5 - Which substance in the following reaction is being...Ch. 5 - Which of the following reactions produces the most...Ch. 5 - Prob. 3MCQCh. 5 - Which of the following compounds has the greatest...Ch. 5 - Prob. 5MCQCh. 5 - Prob. 6MCQCh. 5 - Which culture produces the most lactic acid? Use...Ch. 5 - Which culture produces the most ATP? Use the...Ch. 5 - Which culture uses NAD+? Use the following choices...Ch. 5 - Which culture uses the most glucose? Use the...Ch. 5 - Explain why, even under ideal conditions,...Ch. 5 - The following graph shows the normal rate of...Ch. 5 - Compare and contrast carbohydrate catabolism and...Ch. 5 - How much ATP could be obtained from the complete...Ch. 5 - The chemoautotroph Acidithiobacillus can obtain...Ch. 5 - Haemophilus influenzae requires hemin (X factor)...Ch. 5 - The drug Hivid, also called ddC, inhibits DNA...Ch. 5 - The bacterial enzyme streptokinase is used to...
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- Which picture show reaction rate enzyme catalyzed as substrate concentration. A, B, C or D? A is not marked but is first picture, on top.arrow_forwardKnowing that for a bacterial colony to be able to grow it must produce product "3" AND "4", use the information in the image to describe which enzyme(s) are that are Non-Functional in Colony C? Please note error in enzyme description at bottom of image. X converts 1 into 2; Y converts 1 into 3; and z converts 2 into 4.arrow_forwardWhat is the rate of the reaction at 20 sec for each of the enzyme concentration. Show calculationarrow_forward
- Which of the following statements regarding enzyme catalysis is false? All options are false. Once formed, the transition state slowly proceeds to forming the product at a rate determined by cofactor binding The free energy of binding of the enzyme to the transition state is more favorable than the free energy of binding of the enzyme to the substrate The substrate and active site of the enzyme are solvated to promote enzyme-substrate interaction Once formed, the product dissociates from the enzyme after ATP hydrolysis in order to regenerate the active sitearrow_forwardAt what temperature in the above graph is the enzyme the most active?arrow_forwardan enzyme acts on a substrate X. The enzyme exists in four different forms, with different catalytic efficiencies. The table shows the kcatand KM values for each form of the enzyme. If the concentration of substrate X in a solution is 5 µM, which of the four forms of the enzyme is the most efficient? Form of Enzyme kcat (s-1) KM (µM) A 50 10 B 50 1 C 100 4 D 1000 100 a. Form A b. Form B c. Form D d. Form Carrow_forward
- the graph shows the rate of reaction data for 2 different enzymes. one of these enzymes is found in the stomach, the other is found in the mouth. does both of these enzymes have the same optimum ph? why?arrow_forwardFor images 1, 2, 3, 4, which ones correspond to the statements "a" through "f". It could also be all or nonearrow_forwardWhich of the following statements is true about effect of substrate concentration on enzyme activity ? The rate of reaction increases as the substrate concentration increases up to certain limit at which the reaction rate is maximal (Vmax.) At Vmax, the enzyme is completely saturated with the substrate, At Vmax, any increase in substrate concentration don't affect the reaction rate. All of themarrow_forward
- An allosteric enzyme that follows the concerted mechanism has a T/R ratio of 500 in the absence of substrate. Suppose that a mutation reversed the ratio. How would this mutation affect the relation between the rate of the reaction and substrate concentration? The mutant enzyme would behave like an enzyme that obeys Michaelis Menton kinetics. The mutant enzyme would have a smaller vmax There would be no difference in the mutant enzyme in terms of substrate binding and catalysis. More than one answer is correct. The mutant enzyme would display cooperativity more than the wild type. MacBook Air 888 F5 F4 F3 F2 %23 2$ %arrow_forwardAn enzyme-catalyzed reaction has a Km of 4 mM and a Vmax of 5x10-3 uM/s. What is the reaction velocity when the substrate concentration is: 5 mM 4 mMarrow_forwardAlkaline phosphatase had an optimal temperature of 37°C. If you tested the enzyme at 37°C, 50°C, and 80°C, what would be your expected reaction rates? Graph your expected results (label your axes and lines)arrow_forward
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