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Unformatted text preview: BILD 2 Spring 2008 Dr. Towb Homework #1 4/18/08 1) Of the carbohydrates, fats, and proteins in a hamburger, what has been partially digested prior to entry into the small intestine? Carbohydrates are partially digested in the mouth by salivary amylase, and proteins are partially digested in the stomach by pepsin. 2) Why are there different proteases during the different stages of digestion? Wont just one do the trick? There are different proteases because proteins are comprised of a combination of various amino acids. Proteases as enzymes each recognize a specific substrate which is generally a specific region (specific amino acid residues) on the protein substrate. In order to fully digest the protein, multiple different proteases that can cleave a protein at different amino acid residues are required. Also, different proteases are required to digest proteins in the different environments of the digestive organs (proteases that function optimally in acidic environments in the stomach and proteases that function optimally in the more neutral environment of the small intestine) 3) What does the acidic environment of the stomach do to ingested proteins? How does this aid protein digestion?...
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This note was uploaded on 03/22/2009 for the course BILD BILD 2 taught by Professor Schroeder during the Spring '08 term at UCSD.
- Spring '08