Why the 2nd choice is correct? SolvedO Macmillan LearningThe ATP-binding site of an enzyme is buried in the hydrophobic interior of the enzyme. Suppose that the ionic interactionbetween enzyme and ATP took place at the surface of the enzyme, exposed to water.Would this enzyme-substrate interaction be stronger or weaker at the surface? Why?weaker at the surface, because the distance between the enzyme and substrate decreases in a polar environmentweaker at the surface, because the interior of the enzyme has a lower dielectric constant than waterstronger at the surface, because water has a high dielectric constant compared to the hydrophobic interiorstronger at the surface, because the enzyme-substrate interaction occurs faster in a polar environmentCorrect Answer

Enzyme-Substrate Interactions and the Dielectric ConstantIn biochemical reactions, the strength of…

Answered: Solved O Macmillan Learning The…

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter6: Energy, Enzymes, And Biological Reactions

Section: Chapter Questions

Problem 15TYK

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Test Your Understanding 8. Induced fit means that when a substrate binds to an enzymes active site, (a) it fits perfectly, like a key in a lock (b) the substrate and enzyme undergo conformational changes (c) a site other than the active site undergoes a conformational change (d) the substrate and the enzyme become irreversibly bound to each other (e) c and d
Test Your Understanding Apply and Analyze 14. Consider the following reaction (in water): HCl H+ + Cl Name the reactant(s) and product(s). Does the expression indicate that the reaction is reversible? Could HCl be used as a buffer?
Which of the following analogies best describes the induced-fit model of enzyme-substrate binding? a hug between two people a key fitting into a lock a square peg fitting through the square bole and a round peg fitting through the round hole of a children’s toy the fitting together of two jigsaw puzzle pieces
In an enzymatic reaction: a. the enzyme leaves the reaction chemically unchanged. b. if the enzyme molecules approach maximal rate, and the substrate is continually increased, the rate of the reaction does not reach saturation. c. in the stomach, enzymes would have an optimal activity at a neutral pH. d. increasing temperature above the optimal value slows the reaction rate. e. the least important level of organization for an enzyme is its tertiary structure.
MATHEMATICAL Using the data in Table 15.1, calculate the value of G for the following reaction. Creatinephosphate+GlycerolCreatine+Glycerol-3-phosphate Hint: This reaction proceeds in stages. ATP is formed in the first step, and the phosphate group is transferred from ATP to glycerol in the second step.
Explain in your own words how enzyme feedback inhibition benefits a cell.
Do you think that the Ea for ATP hydrolysis is relatively low or high? Explain your reasoning.
MATHEMATICAL You do an enzyme kinetic experiment and calculate a Vmax of 100 mol of product per minute. If each assay used 0.1 mL of an enzyme solution that had a concentration of 0.2 mg/mL, what would be the turnover number if the enzyme had a molecular weight of 128,000 g/mol?
Which of the following statements about inhibition is true? a. Allosteric inhibitors and allosteric activators are competitive for a given enzyme. b. If an inhibitor binds the active site, it is considered noncompetitive. c. If an inhibitor binds to a site other than the active site, this competitive inhibition. d. A noncompetitive inhibitor is believed to change the shape of the enzyme, making its active site inoperable. e. Competitive inhibition is usually not reversible.
EVOLUTION LINK Some have argued that evolution is impossible because the second law of thermodynamics states that entropy always increases; therefore natural processes cannot give rise to greater complexity. In what ways is this statement a misunderstanding of the laws of thermodynamics?
How Is Metabolism Regulated? (Integrates with Chapter 15.) Metabolic regulation is achieved via regulating enzyme activity in three prominent ways: allosteric regulation, covalent modification, and enzyme synthesis and degradation. Which of the.se three modes of regulation is likely to be the quickest; which the .slowest? For each of these general enzyme regulatory mechanisms, cite conditions in which cells might employ that mode in preference to either of the other two.
Energy transfers take place constantly in everyday activities. Think of two scenarios: cooking on a stove and driving. Explain how the second law of thermodynamics applies to these two scenarios.

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