metabolism - Chap 17 Metabolism 1. Metabolism- all chemical...

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1 Chap 17 Metabolism 1. Metabolism- all chemical rxns that provide energy and the substances required for cell growth. Two types of metabolic rxns. 1. catabolic- break down complex molecules and release energy. 2. Anabolic- require energy to build larger molecules. Mitochondria- make energy Ribosomes –protein synthesis Energy is stored as ATP- breaking of phosphate bonds. ATP is hydrolyzed 7-12 Kcal per ATP 1-2 millon reactions a second ATP + H 2 O ADP + P + energy 1-2 million per second 2. Digestion- convert large molecules to small ones that can be absorbed by the body. figure 17.5 A. Digestion of carbohydrates- α -amylase breaks apart the α -glycosidic bonds in starches to produce small polysaccharides containing 3-8 glucose units called dextrins. Monosaccharides are small enough to move through intestinal - O P O O O - P O O O - P O O O - CH 2 O HO OH N N N N NH 2 ribose adenine phosphate
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2 wall and go into the bloodstream. Used to make ATP or stored in muscle or liver as glycogen. B. Digestion of proteins- Begins in the stomach, pH = 2. Denatures the protein and pepsin hydrolyzes O O O O O O Salivary α -amylase O O maltose + dextrins O O O O Mouth Small intestine amylase, maltase O O O glucose O O sucrose O O lactose Small intestine Sucrase Lactase O O glucose O glucose O fructose galactose
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3 c. Digestion of lipids- enter the small intestine and mix with bile salts from the gall bladder and lipases from the pancrease. Bile salts break the fat globules into smaller droplets called micelles. fat globules bile salts micelles small intestine Pancreatic lipases glycerol + 3fatty acid blood stream soluble insoluble absorbed -intestinal lining coated with proteins lipoproteins used for energy or stored as fat 3. Important Coenzymes A. FAD- (flavin adenine dinucleotide) a coenzyme that accepts hydrogen atoms. Produced from riboflavin (vitamin B
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This note was uploaded on 09/02/2011 for the course CHEM 30b taught by Professor Harrison during the Spring '11 term at West Valley.

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metabolism - Chap 17 Metabolism 1. Metabolism- all chemical...

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