Use the following information to answer the question(s) below. A series of enzymes catalyze the reaction X→Y→ Z → A. Product A binds to the enzyme that converts X to Y at a position remote from its active site. This binding decreases the activity of the enzyme. With respect to the enzyme that converts X to Y, substance A functions as an allosteric inhibitor a competitive inhibitor the substrate an intermediate a coenzyme

Use the following information to answer the question(s) below. A series of enzymes catalyze the reaction X→Y→ Z → A. Product A binds to the enzyme that converts X to Y at a position remote from its active site. This binding decreases the activity of the enzyme. With respect to the enzyme that converts X to Y, substance A functions as an allosteric inhibitor a competitive inhibitor the substrate an intermediate a coenzyme

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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The image shows the rate of an enzyme reaction under conditions of no inhibition, competitive inhibition, and noncompetitive inhibition as reactions labeled uninhibited, A, and B. Which of the following best explains what has occurred in the enzyme reactions? Reaction B shows competitive inhibition, where increased substrate competes with inhibitors for the active site. Reaction A shows noncompetitive inhibition, where increased substrate competes with inhibitors for the active site. Reaction A shows competitive inhibition, where increased substrate does not affect the enzyme’s binding with the inhibitor. Reaction B shows noncompetitive inhibition, where increased substrate does not affect the enzyme’s binding with the inhibitor.
An enzyme has a single active site at which it can bind and hydrolyze either X or Y but the enzyme cannot bind X and Y at the same time. Which of the following statements are TRUE? Multiple answers: Multiple answers are accepted for this question Select one or more answers and submit. For keyboard navigation. SHOW MORE The Km for X will be affected if Y is present in the reaction mixture. a Y is a competitive inhibitor of X. The Km for X will increase. d The Vmax for X will be affected if Y is present in the reaction mixture. pH dependence of Vmax reflects the ionization state of catalytic site residues. e Consider the following: X and Y are methanol (poisonous) and ethanol respectively. If the Km for X= 0.01 M and the Km f for Y = 0.001 M then 0.01 M Y is 10 times the concentration of Y required for 0.5 Vmax. Addition of an enzyme to a chemical reaction increases the ratio of products to reactants (Ken). A mutation in the active site of an enzyme resulting in a large increase in…
Consider the Michaelis-Menten enzymes below and answer the following questions. Kcat (s') 9.5*105 1.4*10* 2.5*102 1.0*107 5.0*10 8.0*10² Enzyme Km (M) A В a. Which enzyme has the highest affinity substrate? How do you know? b. Which enzyme can convert the most substrate to product in a given period of time? How do you know? c. Which enzyme has the highest catalytic efficiency? How do you know?
Which of the following statements is/are TRUE about the Lock and Key model of enzyme-substrate interaction? I. The active site of the enzyme has flexible conformation. II. Only a certain number of substrates can fit on the enzyme's active site. O Both I and II O Neither I nor II O I only O II only
Which of the following is a mechanism of catalysis by co-enzymes? 1. They form intermediate covalent bond with the substrate molecules. II. They polarize bonds because of their electrophilic nature. III. They facilitate electron transfer. Select the correct response: I and II I, II, and III I only II and III II only
Consider the following enzyme cartoons or structures carefully. Note active sites, presence of cofactors, substrates, etc. and then answer the following questions with the applicable numbers 1, 2, 3, 4, None or All. More than one number may apply. 3. 2. 1. GO Substrate Enzyme Substrate Enzyme Pepsin Enolase a. Example(s) of an allosteric enzyme b. Example(s) of a proteolytic enzyme c. Example(s) of an enzyme(s) with cofactor(s) e. Example(s) of an enzyme(s) that could be impacted by an irreversible competitor. d. Example(s) of an enzyme(s) with a second site for feedback control. f. Enzyme(s) definitely composed of two or more protein chains.
Indicate whether each of the following statements describes a reversible competitive inhibitor, a reversible noncompetitive inhibitor, or an irreversible inhibitor. More than one answer may apply.a. Both inhibitor and substrate bind at the active site on a random basis.b. The inhibitor effect cannot be reversed by the addition of more substrate.c. Inhibitor structure does not have to resemble substrate structure.d. The inhibitor and substrate can bind to the enzyme simultaneously
If a competitive inhibitor of an enzyme is added to the mixture of the enzyme and its substrate, the inhibitor will: O a. decrease the value of Vmax for the chemical reaction catalyzed by this enzyme O b. decrease the value of KM for the chemical reaction catalyzed by this enzyme O c. increase the value of KM for the chemical reaction catalyzed by this enzyme O d. increase the value of Vmax for the chemical reaction catalyzed by this enzyme
Draw a typical enzyme and explain how lactose could be broken down by the enzyme. Label the enzyme and explain the difference between competitive and noncompetitive inhibition (which one is more dangerous and why?)
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 %3D 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 %
Using a series of arrows, draw the branch metabolic reaction pathway described by the following statements, and then answer the questions at the end. Use red arrows and X minus signs (-) to indicate inhibitions. The image below gives you an idea of how to start out for creating the pathway. m a. L can form either M or N b. M can form O c. O can form either P or R d. P can form Q e. R can form S f. O inhibits the reaction of L to form M g. Q inhibits the reaction of O to form P h. S inhibits the reaction of O to form R Which step(s), if any, in the above pathway above exhibit feedback inhibition? Selected Answer: Answers: f and a f, g, and hi f and a g h
Use the following graph to diagram the energetics of a chemicalreaction, with and without an enzyme. Be sure to position reactantsand products at appropriate points and to indicate the stages in thereaction and the energy levels.