Study Guide for Campbell Biology
11th Edition
ISBN: 9780134443775
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece, Martha R. Taylor, Michael A. Pollock
Publisher: PEARSON
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Chapter 41, Problem 5IQ
Summary Introduction
To determine: The two types of macromolecules that have been partially digested by the time chime moves into the intestine and where this digestion process occurs, and determine the enzymes involved in it.
Introduction:
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Digestion of proteins in the acidic environment of the stomach is carried
out by the enzyme pepsin. A different enzyme, called trypsin, digests
proteins in the neutral environment of our small intestine. The amount of
each enzyme are the same and the amount of substrate is the same
between the stomach and small intestine. Explain why our bodies use two
different enzymes to digest proteins in the stomach and the small
intestine.
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?
a) What is the general function of all enzymes that are involved in the digestive process.b) Use the Table below to summarise the function of 6 named digestive enzymes that are either secreted from specific regions of the gastrointestinal system, or part of the intestinal brush border.
Enzyme
Site of secretion / Action
Function (to include substrate and product formed)
Chapter 41 Solutions
Study Guide for Campbell Biology
Ch. 41 - How can vegetarians obtain all the essential amino...Ch. 41 - Prob. 2IQCh. 41 - Prob. 3IQCh. 41 - Prob. 4IQCh. 41 - Prob. 5IQCh. 41 - For each of the following molecules, describe...Ch. 41 - Prob. 7IQCh. 41 - Prob. 8IQCh. 41 - Label the indicated structures in the following...Ch. 41 - Prob. 1TYKM
Ch. 41 - Prob. 2TYKMCh. 41 - Prob. 3TYKMCh. 41 - Prob. 4TYKMCh. 41 - Prob. 5TYKMCh. 41 - Prob. 6TYKMCh. 41 - Prob. 7TYKMCh. 41 - Prob. 8TYKMCh. 41 - Prob. 1TYKCh. 41 - Prob. 2TYKCh. 41 - Prob. 3TYKCh. 41 - Prob. 4TYKCh. 41 - Substrate feeders such as earthworms a. eat mostly...Ch. 41 - Prob. 6TYKCh. 41 - Why does salivary amylase not hydrolyze starch in...Ch. 41 - What is the advantage of mechanical digestion of...Ch. 41 - Prob. 9TYKCh. 41 - Prob. 10TYKCh. 41 - Prob. 11TYKCh. 41 - Prob. 12TYKCh. 41 - Prob. 13TYKCh. 41 - Prob. 14TYKCh. 41 - Prob. 15TYKCh. 41 - Prob. 16TYKCh. 41 - Prob. 17TYKCh. 41 - Prob. 18TYK
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- Two substances secreted by cells of the gastric glands are needed to produce the active protein-digesting enzyme pepsin. What are these substances and which cells secrete them?arrow_forwardIdentify a substrate of a digestive enzyme produced by organ A. B.arrow_forwardname the protein digesting enzymes.arrow_forward
- Which of the following is NOT an enzyme secreted into the small intestine as an aid to chemical digestion: A) Bile B) Lipase D) Amylasearrow_forwardWhich of the following correctly lists two organs in which proteins are chemically digested? a.) mouth and stomach b.) mouth and small intestine c.) stomach and small intestine d.) stomach and large intestine e.) small intestine and large intestinearrow_forwardIf proteases such as pepsin and trypsin digest protein, why do not they digest the stomach and small intestine, which are made from proteins?arrow_forward
- A9) The ________phase of stomach function involves the nervous system detecting food in the environment via sight and smell. Group of answer choices Intestinal Gastric Cephalic A10) A pH of 4 will be appropriate for the enzymes working to break bonds in the small intestine. Group of answer choices False True A11) The _________ creates bile, while the ________handles the regulated release of bile. Group of answer choices Gall bladder;Liver Liver;Gallbladder Gallbladder;Pancreas Liver;Pancreas Pancreas;Gallbladder A12) Bile works to chemically digest fats. Group of answer choices True Falsearrow_forwardWhy are protein-digesting enzymes secreted as zymogens? Cite at least 3 references.arrow_forwardThere are several processes that take place from the moment food enters our mouth until it is completely digested and used for energy. Using approximately 400-500 words, describe in detail and in order of process the mechanical (stomach and intestine)and chemical (gastric acid and enzymes) digestion of eating a grilled chicken sandwich with mayonnaise, lettuce, and tomatoes. Note what role the pancreas, gallbladder, and liver play in digestion of the ingredients? From what ingredients is your body deriving its energy and how many basic calories from the macronutrients ingested? Include at least two scholarly references (using APA formatting and style) to guide your answers (note that you can use your textbook as one of your references).arrow_forward
- Why is it necessary for enzymes that digest protein to be secreted in an inactive form?arrow_forwardWhich enzymes are present in saliva? Explain all in detail.arrow_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_forward
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