Which of the following statements about protein digestion are true? Check all that apply. ► View Available Hint(s) Pepsin is active only in an acidic environment. Hydrochloric acid in the stomach denatures proteins and activates some enzymes. The tertiary and secondary structures of proteins unfold due to the action of the enzymes in the gut. Most of the hydrolysis of polypeptides takes place in the small intestine. Some proteins are broken down into amino acids by the process of chewing. The primary structure of a protein is destroyed by hydrolysis.

Which of the following statements about protein digestion are true? Check all that apply. ► View Available Hint(s) Pepsin is active only in an acidic environment. Hydrochloric acid in the stomach denatures proteins and activates some enzymes. The tertiary and secondary structures of proteins unfold due to the action of the enzymes in the gut. Most of the hydrolysis of polypeptides takes place in the small intestine. Some proteins are broken down into amino acids by the process of chewing. The primary structure of a protein is destroyed by hydrolysis.

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter34: Animal Nutrition And The Digestive System

Section: Chapter Questions

Problem 3VCQ: Figure 34.19 Which of the following statements about digestive processes is true? Amylase, maltaseT...

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Figure 34.11 Which of the following statements about the digestive system is false? Chyme is a mixture of food and digestive juices that is produced in the stomach. Food enters the large intestine before the small intestine. In the small intestine, chyme mixes with bile, which emulsifies fats. The stomach is separated from the small intestine by the pylloric sphincter.
Different regions of the digestive system specialize in ________ and _________ food and in __________ unabsorbed food residues.
Using the black lines shown in Figure 11.27, name the types of nutrient molecules present at each site that are small enough to be absorbed across the small intestines lining. Figure 11.27 Fill in the blanks for substances that cross the lining of the small intestine.
The order of successive steps in digestion is: a. absorption follows enzymatic hydrolysis. b. secretion of enzymes follows absorption of digestive material. c. mechanical processing follows enzyme secretion. d. mechanical processing follows enzymatic hydrolysis. e. enzymatic hydrolysis precedes secretion of digestive aids.
Match each organ with its digestive function in humans. _____ gallbladder a. final stop for digestive waste _____ salivary gland b. makes bile _____ colon c. compacts undigested residues _____ liver d. adds enzymes to small intestine _____ esophagus e. delivers food to the stomach _____ rectum f. stores, secretes bile _____ stomach g. secretes gastric fluid _____ pancreas h. secretes enzyme that begins starch digestion
Which of the following digestive enzymes is incorrectly matched with it's substrate and product? pancreatic amylase: starch --> maltose pepsin: protein --> amino acids lipase: fats --> glycerol and fatty acids peptidase: short polypeptides --> amino acids salivary amylase: starch --> maltose
Which of the following statements regarding digestive systems are correct? Glucose monomers are linked together by alpha 1-4 glycosidic bonds in both starch and cellulose. Gastrin is produced by exocrine cells of the gastric glands. Pepsinogen and gastric acid (HCl) are both secreted into the lumen of the stomach.
Which of the following components of digestion is responsible for the chemical breakdown of foods? Group of answer choices Chewing Enzymatic hydrolysis Dissolving Emulsification
How does hydrochloric acid aid in the digestion of food? Hydrochloric acid breaks down the peptide bonds, glycosidic bonds, and acid anhydride bonds among proteins, carbohydrates, and lipids respectively. Hydrochloric acid does not really participate in the digestion of food; however, the acidic environment due to HCl activates pepsinogen which will be converted into pepsin that breaks down peptide bond between amino acids in a polypeptide. Hydrochloric acid is the gastric juice that stops lipid digestion in the stomach. Hydrochloric acid initiates carbohydrate and protein digestion in the stomach.
Follow the route food takes in the human GI tract and know the organs and their key functions including key fluids that are secreted. What actually does the stomach in humans do? (it is NOT the main place of digestion). What is bile (not a digestive enzyme) and where made, where secreted? What does pancreas contribute? Where is most of the food actually broken down into smaller molecular parts = digested? What is major role of large intestine (not digestion, not most absorption of nutrients) What are the muscular contractions that move it all?
You eat a cheeseburger. Describe the process by which the protein, carbohydrates and fats are broken down. Include the locations of each step. Explain how the final products of digestion are absorbed (separately for fat, protein and carbohydrates. Include where this happens, and where they go after. Explain what ingredients in the cheeseburger provide each type of nutrient.
Which of the following descriptions is incorrectly matched to the type of digestion occuring? Acidic pH of gastric juice helping break down proteins and activate enzymes - mechanical digestion Salivary amylase breaking down starch - chemical digestion Peristalsis of the small intestine mixing up chyme - mechanical digestion bile salts helping to emulsify fats and raise the pH - chemical digestion chewing and mixing of food in the mouth - mechanical digestion