Homework Answers
The correct answer is : Enzyme increases the reaction rate of the reaction.
Reason : An enzyme is a biological catalyst which facilates the happening of a chemical reaction by lowering the activation energy barrier by forming highly unstable enzyme-substrate which gives the product. It may also increase the rate of the rection by providing many active sites for substrate attachments.
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Which statement characterizes an enzyme catalyzed reaction? Enzymes change the reaction equilibrium Enzyme-substrate binding is irreversible...
The rate of an enzyme-catalyzed reaction initially increases with an increase in the substrate concentration, but...
The rate of an enzyme-catalyzed reaction initially increases with an increase in the substrate concentration, but eventually reaches a maximum value, even though the concentration of substrate continues to increase. Which of the following best explains why? O As substrate concentration increases, the substrates preferentially bind with each other instead of the active site of the enzyme, and no additional catalysis occurs. As substrate concentration increases, the active sites of all the enzyme molecules become occupied with substrate molecules, and...
Which of the following stages is essential for enzyme catalyzed reaction to occur? A. Enzyme-substrate binding stage B. Substrate transitional stage C. Enzyme-product releasing stage D. A and C E. A,B...
Which of the following stages is essential for enzyme catalyzed reaction to occur? A. Enzyme-substrate binding stage B. Substrate transitional stage C. Enzyme-product releasing stage D. A and C E. A,B and C In terms of source for activation energy, which of the followings is possible? A. releasing of solvent molecules or atoms from enzymes B. releasing of substrates or products from enzymes C. locally or globally reversible changes in enzyme structure D. All above E. None above
Which statement about enzyme catalyzed reactions is not true? a) enzymes form complexes with their substrates....
Which statement about enzyme catalyzed reactions is not true? a) enzymes form complexes with their substrates. b) enzymes lower the activation energy for chemical reactions. c) enzymes change the K eq for chemical reactions. d) many enzymes change shape slightly when substrate binds. e) reactions occur at the "active site" of enzymes, where a precise 3D orientation of amino acids is an important feature of catalysis.
will rate thanks Q1. WHAT ARE ENZYMES? HOW DOES ENZYME-SUBSTRATE BINDING TAKES PLACE? Q2. IN MICHAELIS...
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Q1. WHAT ARE ENZYMES? HOW DOES ENZYME-SUBSTRATE BINDING TAKES PLACE? Q2. IN MICHAELIS -MENTEN GRAPH, WHY DOES THE CURVE REACHES PLATEAU? Vmax Reaction velocity (v) Vm/2 Km Substrate concentration (S) Q3. IN MICHAELIS MENTEN GRAPH, HOW WOULD YOU INCREASE VELOCITY BEYOND Vmax? Q4. SMALLER VALUE OF THE MICHAELIS CONSTANT (Km) REFLECTS HIGHER EFFICIENCY OF THE ENZYME. (TRUE/FALSE).
The concentration of substrate X is low. What happens to the rate of the enzyme- catalyzed reaction if the concentr...
The concentration of substrate X is low. What happens to the rate of the enzyme- catalyzed reaction if the concentration of X is doubled? 15. What effect does an increase in the enzyme concentration have on the rate of an enzyme-catalyzed reaction? 16.
1. Protein kinases phosphorylate target enzymes and as a result enzymes become activated or inactivated. Which...
1. Protein kinases phosphorylate target enzymes and as a result enzymes become activated or inactivated. Which of the statements are TRUE? (Multiple answers: You can select more than one option) A. Phosphorylated enzymes behave like competitive inhibitors B The presence of a phosphate acts as a non-competitive inhibitor/activator. No change in Km but significant change in Vmax C. The presence of a phosphate group induces a conformational change that modifies the affinity and catalytic ability of a target enzyme D....
Question B1. The binding of a substrate (S) to an enzyme (E) can be described by...
Question B1. The binding of a substrate (S) to an enzyme (E) can be described by the equilibrium E + S 4 ES At 273 K the equilibrium constant for this reaction has been found to be 0.134 for a particular substrate and enzyme. (a) Calculate the standard Gibbs energy change for the binding reaction at 273 K. [1 mark] (b) Calculate the free energy change for the reaction when the concentrations of the species at 273 K are: [E]...
9. Which of the following statements about enzyme catalyzed reactions is NOT true? a. Enzymes form...
9. Which of the following statements about enzyme catalyzed reactions is NOT true? a. Enzymes form complexes with their substrates b. Enzymes lower the activation energy for chemical reactions c. Enzymes change the Key for chemical reactions d. Many enzymes change shapes slightly when substrate binds 10. To overcome an energy barrier between reactants and products, energy must be provided to get the reaction started. This energy, which is recovered as the reaction proceeds, is called: a. Activation energy b....
PT1. Which of the following does not describe a mechanism that cells use to regulate enzyme...
PT1. Which of the following does not describe a mechanism that cells use to regulate enzyme activity? Explain. (5 points) Cells control enzyme activity by the binding of small molecules Cells control enzyme activity by phosphorylation and dephosphorylation Cells control the diffusion rates of substrate to enzymes Cells control the rate of enzyme degradation Cells control the rate of enzyme synthesis Cells control the targeting of enzymes to specific organelles PT2. Which of the following properties of an enzyme is...
56. In the lock and key model of substrate binding to enzymes Pprat wnich they work...
56. In the lock and key model of substrate binding to enzymes Pprat wnich they work best a the substrate changes its conformation to fit the active site b. the active site changes its conformation to fit the substrate c. the active site is rigid and the substrate must fit exactly d. the substrate binds only to part of the active site In the induced-fit model of substrate binding a. 57. the substrate changes its conformation to fit the active...
The rate of an enzyme-catalyzed reaction initially increases with an increase in the substrate concentration, but eventually reaches a maximum value, even though the concentration of substrate continues to increase. Which of the following best explains why? O As substrate concentration increases, the substrates preferentially bind with each other instead of the active site of the enzyme, and no additional catalysis occurs. As substrate concentration increases, the active sites of all the enzyme molecules become occupied with substrate molecules, and...
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Q1. WHAT ARE ENZYMES? HOW DOES ENZYME-SUBSTRATE BINDING TAKES PLACE? Q2. IN MICHAELIS -MENTEN GRAPH, WHY DOES THE CURVE REACHES PLATEAU? Vmax Reaction velocity (v) Vm/2 Km Substrate concentration (S) Q3. IN MICHAELIS MENTEN GRAPH, HOW WOULD YOU INCREASE VELOCITY BEYOND Vmax? Q4. SMALLER VALUE OF THE MICHAELIS CONSTANT (Km) REFLECTS HIGHER EFFICIENCY OF THE ENZYME. (TRUE/FALSE).
The concentration of substrate X is low. What happens to the rate of the enzyme- catalyzed reaction if the concentration of X is doubled? 15. What effect does an increase in the enzyme concentration have on the rate of an enzyme-catalyzed reaction? 16.
Question B1. The binding of a substrate (S) to an enzyme (E) can be described by the equilibrium E + S 4 ES At 273 K the equilibrium constant for this reaction has been found to be 0.134 for a particular substrate and enzyme. (a) Calculate the standard Gibbs energy change for the binding reaction at 273 K. [1 mark] (b) Calculate the free energy change for the reaction when the concentrations of the species at 273 K are: [E]...
9. Which of the following statements about enzyme catalyzed reactions is NOT true? a. Enzymes form complexes with their substrates b. Enzymes lower the activation energy for chemical reactions c. Enzymes change the Key for chemical reactions d. Many enzymes change shapes slightly when substrate binds 10. To overcome an energy barrier between reactants and products, energy must be provided to get the reaction started. This energy, which is recovered as the reaction proceeds, is called: a. Activation energy b....
56. In the lock and key model of substrate binding to enzymes Pprat wnich they work best a the substrate changes its conformation to fit the active site b. the active site changes its conformation to fit the substrate c. the active site is rigid and the substrate must fit exactly d. the substrate binds only to part of the active site In the induced-fit model of substrate binding a. 57. the substrate changes its conformation to fit the active...
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