BIO 360 Chapter Notes - Chapter 18: Pancreatic Duct, Zymogen, Carboxypeptidase
Document Summary
Use of amino acids as fuel varies by organism. ~ 90% of energy needs of carnivores can be met by amino acids immediately after a meal. Microorganisms scavenge amino acids from their environment for fuel when needed. Only a small fraction of energy needs of herbivores are met by amino acids. Plants do not use amino acids as a fuel source but can degrade amino act as to form other metabolites. Leftover amino acids from normal protein turnover (e. g. , proteolysis + regeneration of proteins. Dietary amino acids that exceed body"s protein synthesis needs. Proteins in body can be broken down to supply amino acids for energy when carbohydrates are scarce cstarvation , diabetes mellitus) Dietary proteins : enzymatically hydrolyzed: pepsin cuts protein into peptides in the stomach, trypsin + chymotrypsin cuts proteins + larger peptides into smaller peptides. In the small intestine: aminopeptidase + carboxypeptidases a + b degrade peptides into amino acids.
