On a Michaelis-Menten plot, a sigmoidal relationship between velocity and substrate concentration indicates that: Group of answer choices the enzyme is allosteric. either the temperature or pH is not constant the enzyme I operating under the influence of an uncompetitive inhibitor. the enzyme is operating under the influence of a competitive inhibitor. the enzyme is operating at Vmax.
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A Michaelis-Menten plot typically shows the relationship between the reaction velocity (v) and the substrate concentration ([S]). In a typical Michaelis-Menten plot, this relationship is hyperbolic, meaning as substrate concentration increases, the reaction Show more…
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Which of these statements about enzyme-catalyzed reactions is FALSE? An enzyme is a catalyst for speeding up both substrate-to-product and product-to-substrate reactions. A competitive inhibitor changes the Michaelis-Menten constant and maximal velocity of the enzyme-catalyzed reaction. An uncompetitive inhibitor changes the Michaelis-Menten constant and maximal velocity of the enzyme-catalyzed reaction. A non-competitive inhibitor changes the maximal velocity of the enzyme-catalyzed reaction. The Michaelis-Menten constant is the substrate concentration at which the enzyme-catalyzed reaction attains half-maximal velocity.
Shaiju T.
16. The steady state assumption, as applied to enzyme kinetics, implies: A) Km = Ks. B) the enzyme is regulated. C) the ES complex is formed and broken down at equivalent rates. D) the Km is equivalent to the cellular substrate concentration. E) the maximum velocity occurs when the enzyme is saturated. 17. The number of substrate molecules converted to product in a given unit of time by a single enzyme molecule at saturation is referred to as the: A) dissociation constant. B) half-saturation constant. C) maximum velocity. D) Michaelis-Menten number. E) turnover number. 18. The interactions of ligands with proteins: A) are relatively nonspecific. B) are relatively rare in biological systems. C) are usually irreversible. D) are usually transient. E) usually result in the inactivation of the proteins. 19. A prosthetic group of a protein is a non-protein structure that is: A) a ligand of the protein. B) a part of the secondary structure of the protein. C) a substrate of the protein. D) permanently associated with the protein. E) transiently bound to the protein. 20. In the binding of oxygen to myoglobin, the relationship between the concentration of oxygen and the fraction of binding sites occupied can best be described as: A) hyperbolic. B) linear with a negative slope. C) linear with a positive slope. D) random. E) sigmoidal.
Madhur L.
The Michaelis-Menten equation is one of the fundamental equations describing the way single substrate enzymes behave. This equation is often represented as the following: v = Vmax[S] / (Km + [S]) v represents the rate of the reaction catalyzed by a certain enzyme, Vmax the maximum achievable rate of the reaction, Km represents the Michaelis-Menten constant, and [S] represents the concentration of substrate. Part I (20 points): Sketch the overall profile of Reaction Rate vs. Substrate Concentration. The Reaction Rate should be normalized to the maximum reaction rate, and the substrate concentration should range from 0 to 500 mM. Let Km = 15 mM and Vmax = 1 mM/s. Part II (30 points): Answer the following questions: a. What is the relationship between the maximum rate (Vmax) and the Michaelis-Menten constant (Km)? (10 points) b. Competitive inhibitors are molecules that bind to an enzyme’s active site. Which variable in the Michaelis-Menten equation do competitive inhibitors affect? Does that variable increase or decrease? (10 points) c. Many of the enzymes in oxidative phosphorylation follow the Michaelis-Menten kinetics described above. The proton pump ATPase that generates ATP using the proton concentration gradient in the mitochondria is an example. Assume that this ATPase uses the following parameters: Km = 15 mM and Vmax = 1 as before, and that the substrate concentration of ADP is usually 500 mM and it generates a given amount of ATP. Will the generation of ATP be significantly larger with [ADP] = 1000 mM? What about [ADP] = 10 × 10^6 mM? Briefly explain your answer. (10 points)
Sri K.
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