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BI 107 Chapter 5 - Chapter 5 Structure and function of macromolecules in the cell Polymers • Composed of monomers • Synthesis – dehydration

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Unformatted text preview: Chapter 5 Structure and function of macromolecules in the cell Polymers • Composed of monomers • Synthesis – dehydration reaction, water is removed to make a covalent bond between the 2 monomers • Breakdown – hydrolysis reaction, water is added to break a covalent bond in a polymer. • Dehydration and hydrolysis reactions are the reverse of each other. Fig. 5-2a Dehydration removes a water molecule, forming a new bond Short polymer Unlinked monomer Longer polymer Dehydration reaction in the synthesis of a polymer HO HO HO H 2 O H H H 4 3 2 1 1 2 3 (a) Fig. 5-2b Hydrolysis adds a water molecule, breaking a bond Hydrolysis of a polymer HO HO HO H 2 O H H H 3 2 1 1 2 3 4 (b) Carbohydrates • What is the monomer unit • What is the function of the polymer? Fig. 5-5 (b) Dehydration reaction in the synthesis of sucrose Glucose Fructose Sucrose Maltose Glucose Glucose (a) Dehydration reaction in the synthesis of maltose 1–4 glycosidic linkage 1–2 glycosidic linkage Fig. 5-6 (b) Glycogen: an animal polysaccharide Starch Glycogen Amylose Chloroplast (a) Starch: a plant polysaccharide Amylopectin Mitochondria Glycogen granules 0.5 µm 1 µm Fig. 5-7 (a) α and β glucose ring structures α Glucose β Glucose b) Starch: 1–4 linkage of α glucose monomers (b) Cellulose: 1–4 linkage of β glucose monomers Lipids • Fats (triglycerides) – What is(are) the monomer unit(s)?...
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This note was uploaded on 09/20/2011 for the course BIO 107 taught by Professor Berney during the Fall '10 term at Montgomery CC.

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BI 107 Chapter 5 - Chapter 5 Structure and function of macromolecules in the cell Polymers • Composed of monomers • Synthesis – dehydration

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