Textbook Question
Indicate whether each of the following describes a competitive or a noncompetitive enzyme inhibitor:
d. The structure of the inhibitor is not similar to the substrate.
Ch.16 Amino Acids, Proteins, and Enzymes
Timberlake13th EditionChemistry: An Introduction to General, Organic, and Biological ChemistryISBN: 9780134421353
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Table of contents
- Ch.1 Chemistry in Our Lives11
- Ch.2 Chemistry and Measurements80
- Ch.3 Matter and Energy54
- Ch.4 Atoms and Elements51
- Ch.5 Nuclear Chemistry42
- Ch.6 Ionic and Molecular Compounds57
- Ch.7 Chemical Quantities and Reactions41
- Ch.8 Gases29
- Ch.9 Solutions51
- Ch.10 Acids and Bases and Equilibrium65
- Ch.11 Introduction to Organic Chemistry: Hydrocarbons78
- Ch.12 Alcohols, Thiols, Ethers, Aldehydes, and Ketones83
- Ch.13 Carbohydrates54
- Ch.14 Carboxylic Acids, Esters, Amines, and Amides90
- Ch.15 Lipids61
- Ch.16 Amino Acids, Proteins, and Enzymes84
- Ch.17 Nucleic Acids and Protein Synthesis83
- Ch.18 Metabolic Pathways and ATP Production67
Timberlake13th EditionChemistry: An Introduction to General, Organic, and Biological ChemistryISBN: 9780134421353Not the one you use?Change textbook
Chapter 16, Problem 46a
Refer to the graph in problem 16.45 to determine if the reaction rate in each condition will be at the optimum rate or not.
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a. trypsin, pH 5.0
Verified step by step guidance1
Understand the problem: The question asks us to determine if the reaction rate of trypsin at pH 5.0 is at its optimum rate. To do this, we need to refer to the graph mentioned in problem 16.45, which likely shows the relationship between pH and the activity of trypsin.
Recall the concept: Trypsin is an enzyme, and enzymes have an optimal pH at which they function most efficiently. For trypsin, the optimal pH is typically around 7.5 to 8.5, as it is an enzyme that operates in the small intestine, which has a slightly basic environment.
Analyze the given condition: The problem specifies a pH of 5.0. Compare this pH to the optimal pH range of trypsin. Since pH 5.0 is acidic and outside the optimal range, the reaction rate is expected to be lower than the optimum.
Refer to the graph: If the graph in problem 16.45 is available, locate the point corresponding to pH 5.0 and observe the reaction rate. Compare it to the peak reaction rate on the graph to confirm that the rate is not at its optimum.
Conclude: Based on the information about trypsin's optimal pH and the graph, determine that the reaction rate at pH 5.0 is not at the optimum rate because it is outside the enzyme's preferred pH range.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Enzyme Activity
Enzyme activity refers to the rate at which an enzyme catalyzes a reaction. This activity can be influenced by various factors, including substrate concentration, temperature, and pH. Understanding how these factors affect enzyme function is crucial for determining whether a reaction is occurring at its optimum rate.
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Factors Affecting Enzyme Activity Concept 1
pH and Enzyme Function
The pH level of a solution can significantly impact enzyme activity. Each enzyme has an optimal pH range where it functions most effectively. For trypsin, which is active in the digestive system, the optimal pH is around 7.5 to 8.5, meaning that a pH of 5.0 may hinder its activity and lead to a suboptimal reaction rate.
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Reaction Rate
The reaction rate is the speed at which reactants are converted into products in a chemical reaction. In enzymatic reactions, the rate can be measured by the amount of product formed over time. Factors such as enzyme concentration, substrate availability, and environmental conditions like pH play critical roles in determining whether the reaction rate is at its optimum.
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Related Practice
Textbook Question
Pepsin, a peptidase that hydrolyzes proteins, functions in the stomach at an optimum pH of 1.5 to 2.0. How is the rate of a pepsin-catalyzed reaction affected by each of the following conditions?
a. changing the pH to 5.0
Textbook Question
Trypsin, a peptidase that hydrolyzes polypeptides, functions in the small intestine at an optimum pH of 7.7 to 8.0. How is the rate of a trypsin-catalyzed reaction affected by each of the following conditions?
b. running the reaction at 75 °C
Textbook Question
Oxaloacetate is an inhibitor of succinate dehydrogenase.
a. Would you expect oxaloacetate to be a competitive or a noncompetitive inhibitor? Why?
Textbook Question
Indicate whether each of the following describes a competitive or a noncompetitive enzyme inhibitor:
a. The inhibitor has a structure similar to the substrate.
Textbook Question
The following graph shows the activity versus pH curves for pepsin, sucrase, and trypsin. Estimate the optimum pH for each.
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