Human Physiology
15th Edition
ISBN: 9781259864629
Author: Fox, Stuart Ira
Publisher: Mcgraw-hill Education,
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Textbook Question
Chapter 4, Problem 3CP
Draw graphs to represent the effects of changes in temperature, pH, and enzyme and substrate concentration on the
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Please handraw this graph with all the necessary detailed information:
Imagine that I text enzyme rate for four different temperatures: 10 degrees celsius, 20 degrees celsisus, 30 degree celsius, and 40 degree celsius, in separate tubes. The enzyme appears to work faster as temperature increases, but completely ceases activity at 40 degrees celcius. Sketch a graph to show this outcome, but here you will graph product formation (nmoles/mL) vs. time (minutes). The graph should be 4 lines and HANDDRAWN. Include a legend if necessary. You do not need precise quantitivate values, but most show the correct trends on the graph.
Consider the following data set of enzymes A, B C and D which catalyze the same
reaction.
Enzyme A km = 5mM Vmax = 225MM/sec
Enzyme B km = 50mM Vmax = 430mM/sec
Enzyme C km = 15mM Vmax = 235mM/sec
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Enzyme D km
12mM Vmax = 533mM/sec
When concentrations of substrate are very low, which is the enzyme that is
producing most product?
MacBook Air
DO
F5
S0
# 12
F4
F3
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Define the following as they apply to an enzymatic reaction. Give an example of each.
a. Enzyme-limited:
b. Substrate-limited:
Chapter 4 Solutions
Human Physiology
Ch. 4 - Use the lock-and-key model to explain how enzymes...Ch. 4 - Explain how enzymes are named, and the nature of...Ch. 4 - Draw graphs to represent the effects of changes in...Ch. 4 - Prob. 4CPCh. 4 - Prob. 5aCPCh. 4 - Prob. 5bCPCh. 4 - Prob. 5cCPCh. 4 - Prob. 6aCPCh. 4 - Define the terms exergonic reaction and endergonic...Ch. 4 - Prob. 7aCP
Ch. 4 - Prob. 7bCPCh. 4 - Which of these statements about enzymes is...Ch. 4 - Which of these statements about enzyme-catalyzed...Ch. 4 - Which of these statements about lactate...Ch. 4 - In a metabolic pathway, a. the product of one...Ch. 4 - In an inborn error of metabolism,
a. a genetic...Ch. 4 - Which of these represents an endergonic...Ch. 4 - Which of these statements about ATP is true? a....Ch. 4 - When oxygen is combined with 2 hydrogens to make...Ch. 4 - Enzymes increase the rate of chemical reactions...Ch. 4 - According to the law of mass action, which of...Ch. 4 - Explain the relationship between an enzyme's...Ch. 4 - Explain how the rate of enzymatic reactions may be...Ch. 4 - Explain how end-product inhibition represents a...Ch. 4 - Prob. 14RACh. 4 - The coenzymes NAD and FAD can "shuttle" hydrogens...Ch. 4 - Prob. 16RACh. 4 - Why do we need to eat food containing niacin and...Ch. 4 - Metabolic pathways can be likened to intersecting...Ch. 4 - Prob. 19RACh. 4 - Suppose you come across a bottle of enzyme tablets...Ch. 4 - Describe the energy transformations that occur...Ch. 4 - Use the reversible reactions involving the...Ch. 4 - Use the graph here and in figure 4.4 to answer the...Ch. 4 - Use the graph here and in figure 4.4 to answer the...Ch. 4 - Prob. 25RACh. 4 - Prob. 26RACh. 4 - Prob. 27RA
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- Using the table below, differentiate the effect of two varying pH levels (as indicated by by the color) to the amylase enzyme. How does pH level affects the enzymatic reaction (enzyme-substrate complex)? Tube 1 Tube 2 Tube 3 Tube 4 Ingredients StarchAmylaseBuffer pH 7 StarchAmylaseBuffer pH 2 MaltoseWaterBuffer pH 7 StarchWaterBuffer pH 7 Color (1) (2) Orange Blue e3333arrow_forwardFor each of the statements below about the dUTPase enzyme, mark whether it is true or false. If it is false, change the language to make the statement true. _______If the dUTPase enzyme is the rate determining step in a larger metabolic pathway, the reaction likely lies near to equilibrium and is irreversible. _______For the dUTPase reaction, it is not likely that DG’ = DG°’ _______ dUTPase has a higher affinity for its substrate than for its product, but both of these are higher than the affinity for the transition state _______Kinetic analysis of dUTPase using Michaelis-Menten methods assumes that the formation of the E*S complex has a large negative value for DGarrow_forwardDiscuss the different factors affecting the rate of an enzymatic reaction. Explain enzyme kinetics including zero-order and first-order kinetics.arrow_forward
- Describe the rate of enzyme-catalyzed reaction with increasing substrate concentration at constant enzyme concentration. In what ways does hydrogen ion concentration affect enzyme activity?arrow_forwardEnumerate the mechanism on how enzyme activity is regulated. Provide at least one example for each mechanism.arrow_forwardFor an enzymatic reaction, draw curves that show the appropriate relationships between the variables in each plot below.arrow_forward
- One way of expressing the rate at which an enzyme can catalyze a reaction is to state its turnover number. The turnover number is the maximum number of substrate molecules that can be acted on by one molecule of enzyme per unit of time. The turnover number for an enzyme (per second) is 752 How many molecules of substrate can one molecule of the enzyme act on in 19.2 min?arrow_forwardExamine the figure below, which compares the energetics of a catalyzed and uncatalyzed reaction during the progress of the reaction from substrate (S) to product (P). The highest peak in such a diagram corresponds to the transition state, which is an unstable, high-energy arrangement of substrate atoms that is intermediate between substrate and product. The free energy required to surmount this barrier to the reaction is termed the activation energy. Enzymes function by lowering the activation energy, thereby allowing a more rapid approach to equilibrium. UNCATALYZED activation energy progress of reaction CATALYZED activation energy S ES | progress of reaction free energy free energyarrow_forwardWhat factors of the physical environment impact enzymatic activity? Select all that apply.arrow_forward
- The figure displays the relationship between initial rate of product formation and reactant concentration in an enzyme-catalyzed reaction with a fixed amount of enzyme. Which of the following statements best explains the shape of the rate curve at high reactant concentration?arrow_forwardDescribe the specific multi-enzyme example discussed in class of how enzyme activity can be altered by changing its substrate to product ratio.arrow_forwardlace the description with the appropriate step in the enzymatic reaction. The enzyme changes shape, resulting in an induced fit between substrate and enzyme. Glucose and galactose are released, and the enzyme is free to bind other substrates. Lactose Galactose Glucose- Substrate: Lactose Enzyme: Lactase 2 1 Enzyme-substrate complex The bond is broken between glucose and galactose 3 The substrate, lactose, binds to the enzyme forming an enzyme- substrate complexarrow_forward
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