Biology: The Dynamic Science (MindTap Course List)
Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 47, Problem 10TYK
Summary Introduction

Introduction:

Based on the mode of survival, the basic vertebrate digestive system of the vertebrates undergoes a multitude of structural and functional variations. The forms of mouth, structures of teeth and jaws, and the functions of the esophagus, stomach, and cecum, and the length of the digestive tract are examples of the most common modifications. The vertebrates also show the presence of microorganisms in their digestive tracts that derive symbiotic relationship with the animal.

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The purpose of Microvilli in the human digestive tract is to:  a.    kill detrimental bacteria in the esophagus b. emulsify fats c.    secrete pepsinogen in the stomach d.    absorb nutrients from the small intestine into the bloodstream e.    secrete trypsinogen and chymotrypsin into the duodenum
Which of the following is true about carbohydrate digestion? A. Cellulose and lignin found in plants are totally indigestible even with intestinal bacteria. B. The acidity of the stomach prevents chemical digestion of carbohydrates. C. Dextrin and maltose are the products of chemical digestion of starch by pancreatic amylase. D. Disaccharidases produced from the pancreas breaks down oligosaccharides in the intestines.
Which of the following statements regarding protein digestion is incorrect? A. The intestinal enzymes trypsin and chymotrypsin continue the chemical breakdown of polypeptides into oligopeptides. B. Chemical digestion of proteins is initiated in the stomach through the action of the enzyme pepsin. C. Mechanical digestion of proteins starts in the mouth through chewing. D. Di- and tripeptides enter the intestinal cells where they are broken down by peptidases into individual amino acids.
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