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We have said that animals obtain chemical energy from the fooda€”carbohydrates, fats, and proteinsa€”they eat through reactions defined collectively as catabolism.
In stage II, these monomer units (or building blocks) are further broken down through different reaction pathways, one of which produces ATP, to form a common end product that can then be used in stage III to produce even more ATP. Carbohydrate digestion begins in the mouth (Figure 20.5 "The Principal Events and Sites of Carbohydrate Digestion"), where salivary I±-amylase attacks the I±-glycosidic linkages in starch, the main carbohydrate ingested by humans. Protein digestion begins in the stomach (Figure 20.6 "The Principal Events and Sites of Protein Digestion"), where the action of gastric juice hydrolyzes about 10% of the peptide bonds. The pain of a gastric ulcer is at least partially due to irritation of the ulcerated tissue by acidic gastric juice. Aminopeptidases in the intestinal juice remove amino acids from the N-terminal end of peptides and proteins possessing a free amino group. This diagram illustrates where in a peptide the different peptidases we have discussed would catalyze hydrolysis the peptide bonds.
Lipid digestion begins in the upper portion of the small intestine (Figure 20.9 "The Principal Events and Sites of Lipid (Primarily Triglyceride) Digestion"). The monoglycerides and fatty acids cross the intestinal lining into the bloodstream, where they are resynthesized into triglycerides and transported as lipoprotein complexes known as chylomicrons. The further metabolism of monosaccharides, fatty acids, and amino acids released in stage I of catabolism occurs in stages II and III of catabolism. In what section of the digestive tract does most of the carbohydrate, lipid, and protein digestion take place? Aminopeptidase catalyzes the hydrolysis of amino acids from the N-terminal end of a protein, while carboxypeptidase catalyzes the hydrolysis of amino acids from the C-terminal end of a protein. During digestion, carbohydrates are broken down into monosaccharides, proteins are broken down into amino acids, and triglycerides are broken down into glycerol and fatty acids. Using chemical equations, describe the chemical changes that triglycerides undergo during digestion. What are the expected products from the enzymatic action of chymotrypsin on each amino acid segment?
What are the expected products from the enzymatic action of trypsin on each amino acid segment?


Chymotrypsin is found in the small intestine and catalyzes the hydrolysis of peptide bonds following aromatic amino acids. Pepsin is found in the stomach and catalyzes the hydrolysis of peptide bonds, primarily those that occur after aromatic amino acids. Bile salts aid in digestion by dispersing lipids throughout the aqueous solution in the small intestine.
Emulsification is important because lipids are not soluble in water; it breaks lipids up into smaller particles that can be more readily hydrolyzed by lipases.
We have said that animals obtain chemical energy from the food—carbohydrates, fats, and proteins—they eat through reactions defined collectively as catabolism. Carbohydrate digestion begins in the mouth (Figure 20.5 "The Principal Events and Sites of Carbohydrate Digestion"), where salivary ?-amylase attacks the ?-glycosidic linkages in starch, the main carbohydrate ingested by humans.
What issues may arise as technology reveals more genes that can be tested If you were on a committee for the government to set up regulations for genetic testing what might be some things to consider? What statement best illustrate the difference between merit principles and prohibited practices? See the license for more details, but that basically means you can share this book as long as you credit the author (but see below), don't make money from it, and do make it available to everyone else under the same terms. However, the publisher has asked for the customary Creative Commons attribution to the original publisher, authors, title, and book URI to be removed. We can think of catabolism as occurring in three stages (Figure 20.4 "Energy Conversions").
The secretion of I±-amylase in the small intestine converts any remaining starch molecules, as well as the dextrins, to maltose.
Gastric juiceA mixture of water, inorganic ions, hydrochloric acid, and various enzymes and proteins found in the stomach. Pancreatic juice, carried from the pancreas via the pancreatic duct, contains inactive enzymes such as trypsinogen and chymotrypsinogen. Figure 20.8 "Hydrolysis of a Peptide by Several Peptidases" illustrates the specificity of these protein-digesting enzymes.
A hormone secreted in this region stimulates the gallbladder to discharge bile into the duodenum. Phospholipids and cholesteryl esters undergo similar hydrolysis in the small intestine, and their component molecules are also absorbed through the intestinal lining. Chymotrypsin catalyzes the hydrolysis of peptide bonds following aromatic amino acids, while trypsin catalyzes the hydrolysis of peptide bonds following lysine and arginine. The secretion of ?-amylase in the small intestine converts any remaining starch molecules, as well as the dextrins, to maltose. You may also download a PDF copy of this book (72 MB) or just this chapter (5 MB), suitable for printing or most e-readers, or a .zip file containing this book's HTML files (for use in a web browser offline).


In stage I, carbohydrates, fats, and proteins are broken down into their individual monomer units: carbohydrates into simple sugars, fats into fatty acids and glycerol, and proteins into amino acids. HCl helps to denature food proteins; that is, it unfolds the protein molecules to expose their chains to more efficient enzyme action. The amino acids that are released by protein digestion are absorbed across the intestinal wall into the circulatory system, where they can be used for protein synthesis. The principal constituents of bile are the bile salts, which emulsify large, water-insoluble lipid droplets, disrupting some of the hydrophobic interactions holding the lipid molecules together and suspending the resulting smaller globules (micelles) in the aqueous digestive medium.
One part of stage I of catabolism is the breakdown of food molecules by hydrolysis reactions into the individual monomer unitsa€”which occurs in the mouth, stomach, and small intestinea€”and is referred to as digestionThe breakdown of food molecules by hydrolysis reactions into the individual monomer units in the mouth, stomach, and small intestine..
Disaccharides such as sucrose and lactose are not digested until they reach the small intestine, where they are acted on by sucrase and lactase, respectively. The principal digestive component of gastric juice is pepsinogen, an inactive enzyme produced in cells located in the stomach wall. One part of stage I of catabolism is the breakdown of food molecules by hydrolysis reactions into the individual monomer units—which occurs in the mouth, stomach, and small intestine—and is referred to as digestionThe breakdown of food molecules by hydrolysis reactions into the individual monomer units in the mouth, stomach, and small intestine.. The major products of the complete hydrolysis of disaccharides and polysaccharides are three monosaccharide units: glucose, fructose, and galactose. When food enters the stomach after a period of fasting, pepsinogen is converted to its active forma€”pepsina€”in a series of steps initiated by the drop in pH. Chymotrypsin preferentially attacks peptide bonds involving the carboxyl groups of the aromatic amino acids (phenylalanine, tryptophan, and tyrosine).
When food enters the stomach after a period of fasting, pepsinogen is converted to its active form—pepsin—in a series of steps initiated by the drop in pH. Trypsin attacks peptide bonds involving the carboxyl groups of the basic amino acids (lysine and arginine).
It has a fairly broad specificity but acts preferentially on linkages involving the aromatic amino acids tryptophan, tyrosine, and phenylalanine, as well as methionine and leucine. Pancreatic juice also contains procarboxypeptidase, which is cleaved by trypsin to carboxypeptidase. The latter is an enzyme that catalyzes the hydrolysis of peptide linkages at the free carboxyl end of the peptide chain, resulting in the stepwise liberation of free amino acids from the carboxyl end of the polypeptide.



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