Human Physiology: An Integrated Approach (8th Edition)
8th Edition
ISBN: 9780134605197
Author: Dee Unglaub Silverthorn
Publisher: PEARSON
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Question
Chapter 21.6, Problem 14CC
Summary Introduction
To determine: The way in which pH can be used to determine the location at which the activity of a particular digestive enzyme is maximum.
Introduction: Enzymes are the proteins that increase the
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Students have asked these similar questions
Suppose that you perform an experiment to observe the effect of temperature and pH on the
enzymatic activity of salivary amylase using the Iodine test, and starch as the substrate.
Complete the table below:
Temperature (°C)
Color of solution
Rank (1 - greatest digestion and 3 - least digestion)
with I2
4
37
100
pH
Color of solution
Rank (1 - greatest digestion and 3 -least digestion)
with I2
4
7
10
The catalytic activity of enzymes depends on the presence of appropriate environmental
conditions. Pepsin is a digestive enzyme found in the stomach and facilitates the digestion
of large proteins.
If pepsin is removed from this acidic environment of the stomach and is instead placed in
a more basic environment, it will cease to function. Describe the specific effect that a
change in environmental pH will have on pepsin and explain how this change can lead to
inhibition of its catalytic activity.
Respond in 4 to 6 complete sentences.
Suppose you have a test tube containing olive oil and pancreatic lipase in a pH 7.0 buffer incubating at 37°C for 1 hour.
a) Identify two different observations or measurements you can make in order to determine whether digestion of the oil occurred.
b) Do you think digestion occurs under these conditions? What could have made digestion more efficient?
Chapter 21 Solutions
Human Physiology: An Integrated Approach (8th Edition)
Ch. 21.1 - Prob. 1CCCh. 21.1 - Prob. 2CCCh. 21.1 - Prob. 3CCCh. 21.2 - Define digestion. What is the difference between...Ch. 21.2 - Prob. 5CCCh. 21.2 - Draw a cell showing (1) an enzyme in a cytoplasmic...Ch. 21.2 - Prob. 7CCCh. 21.2 - Prob. 8CCCh. 21.2 - Prob. 9CCCh. 21.3 - Prob. 10CC
Ch. 21.4 - Prob. 11CCCh. 21.6 - Do bile salts digest triglycerides into...Ch. 21.6 - Prob. 13CCCh. 21.6 - Prob. 14CCCh. 21.6 - What activates pepsinogen, trypsinogen, and...Ch. 21.6 - Prob. 16CCCh. 21 - Match each of the following descriptions with the...Ch. 21 - Prob. 2RQCh. 21 - Prob. 3RQCh. 21 - Prob. 4RQCh. 21 - Prob. 5RQCh. 21 - Prob. 6RQCh. 21 - What purposes does motility serve in the...Ch. 21 - Prob. 8RQCh. 21 - Match each of the following cells with the...Ch. 21 - Prob. 10RQCh. 21 - Prob. 11RQCh. 21 - Prob. 12RQCh. 21 - Prob. 13RQCh. 21 - What role do paracrines play in digestion? Give...Ch. 21 - Prob. 15RQCh. 21 - Prob. 16RQCh. 21 - Prob. 17RQCh. 21 - Prob. 18RQCh. 21 - Prob. 19RQCh. 21 - Prob. 20RQCh. 21 - Prob. 21RQCh. 21 - Prob. 22RQCh. 21 - Mary Littlefeather arrives in her physicians...Ch. 21 - Using what you have learned about epithelial...Ch. 21 - Intestinal transport of the amino acid analog MIT...
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Similar questions
- Explain the importance of pH on digestive enzyme functionarrow_forwardThe activity of pepsin was measured at various pH values. The temperature and the concentrations of pepsin and substrate were held constant. The following activities were obtained: pH activity 1.0 0.5 1.5 2.6 2.0 4.8 3.0 2.0 4.0 0.4 5.0 0.0 Plot a graph of the pH dependence of pepsin activity. Based on the graph what is the optimum pH? Predict the activity of pepsin in the blood at pH 7.4.arrow_forwardBriefly explain the process of protein digestion: where it occurs, what enzymes are involved, and the order of stepsarrow_forward
- Provide a complete graphical representation of the digestion of carbohydrates so that the phases of digestion, the place of digestion and the enzyme involved are clear.arrow_forwardIntroduction to Experiment 2: Protein Digestion by Pepsin In this experiment, we will look at for evidence of protein digestion using albumin, a protein, and Biuret reagent. Biuret reagent is used to test for the presence of proteins, or more specifically, peptide bonds. When long polypeptide chains are present the solution will turn violet, and when shorter polypeptide chains are present the solution will turn a lighter pink color. What is/are the end product(s) of protein digestion? ____________________________________________________________ What is the purpose of the enzyme pepsin? _______________________________________________________________________ If protein digestion has occurred, will the solution be violet or pink (choose one)? _________________ Hypotheses/Predictions (See Methods section for details): What color do you expect the solution to turn when the P tubes are mixed with Biuret solution and why? P1…arrow_forwardIntroduction to Experiment 2: Protein Digestion by Pepsin In this experiment, we will look at for evidence of protein digestion using albumin, a protein, and Biuret reagent. Biuret reagent is used to test for the presence of proteins, or more specifically, peptide bonds. When long polypeptide chains are present the solution will turn violet, and when shorter polypeptide chains are present the solution will turn a lighter pink color. What is/are the end product(s) of protein digestion? Amino acids What is the purpose of the enzyme pepsin? It helps in the digestion of proteins by breaking down the peptide bonds between amino acids into smaller peptides If protein digestion has occurred, will the solution be violet or pink (choose one)? Hypotheses/Predictions (See Methods section for details): What color do you expect the solution to turn when the P tubes are mixed with Biuret solution and why? P1 P2 P3 P4 The least protein digestion (or none at all) will take place in tubes…arrow_forward
- The pH has a crucial role in the activation (or deactivation) of enzymes, which regulate digestion and avoid autodigestion (digesting yourself instead of the food). Describe the pH variations along the digestive tract and identify the organs responsible for these changes. Which enzymes are activated and deactivated during the course of the process? How exactly does this protect our digestive system? What other protections does the digestive system implement?arrow_forwardList all enzymes in the digestive tract that catalyzes hydrolysis of carbohydrates, fats, and proteins. Where are they synthesized? What is the optimum pH of each? What triggers their synthesis and release? Tabulate your answer.arrow_forwardname the protein digesting enzymes.arrow_forward
- create a flow chart or diagram to illustrate the digestion and absorption of carbohydrates. The starting carbohydrate molecules are starch, sucrose, lactose, glycogen, and cellulose. What will happen to these carbohydrates once we ingest them? Include the following from your flow chart or diagram: 1) the location or site where the digestion or absorption occurs 2) the enzymes 3) the products generated at each site or locationarrow_forwardThe catabolic enzyme alpha-amylase is active in some parts of the digestive system but not in others. What property of aqueous solutions controls its level of activity and how? If this property was out of the normal range in the areas of the digestive system where the enzyme is normally active, how would the catabolism of the substrate of alpha-amylase be affected?arrow_forwardDetermine the location within the human body where each of the following aspects of carbohydrate digestion occurs. 1. The enzyme sucrase is active 2. Hydrolysis reactions converting polysaccharides to disaccharides occur 3. First site where breaking of glycosidic linkages occurs 4. The monosaccharide glucose, fructose, and galactose are produced 5. Pancreatic enzyme is active 6. Hydrolysis reaction converting disaccharide to monosaccharide occur 7. Monosaccharide enter the bloodstream 8. The primary site for CHO digestion is located here. 9. Gastric juice is present 10. Salivary amylase is present here.arrow_forward
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