chapter3_part1 - Molecules of Life Chapter 3 Part 1...

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Molecules of Life Chapter 3 Part 1
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Impacts, Issues: Fear of Frying Trans fats in hydrogenated vegetable oil raise levels of cholesterol in our blood more than any other fat, and directly alter blood vessel function
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Organic Molecules All molecules of life are built with carbon atoms We can use different models to highlight different aspects of the same molecule
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3.1 Carbon – The Stuff of Life Organic molecules are complex molecules of life, built on a framework of carbon atoms Carbohydrates Lipids Proteins Nucleic acids
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Carbon – The Stuff of Life Carbon atoms can be assembled and remodeled into many organic compounds Can bond with one, two, three, or four atoms Can form polar or nonpolar bonds Can form chains or rings
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Carbon Rings
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Representing Structures of Organic Molecules Structural model of an organic molecule Each line is a covalent bond; two lines are double bonds; three lines are triple bonds
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Representing Structures of Organic Molecules Carbon ring structures are represented as polygons; carbon atoms are implied
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Representing Structures of Organic Molecules Ball-and-stick models show positions of atoms in three dimensions; elements are coded by color
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Representing Structures of Organic Molecules Space-filling models show how atoms sharing electrons overlap
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Three Models of a Hemoglobin Molecule
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Fig. 3-3 (top), p. 37
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red blood cell Fig. 3-3 (top), p. 37
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Fig. 3-3a, p. 37 A A space-filling model of hemoglobin shows the complexity of the molecule.
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Fig. 3-3b, p. 37 B A surface model of the same molecule reveals crevices and folds that are important for its function. Heme groups, in red, are cradled in pockets of the molecule.
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Fig. 3-3c, p. 37 C A ribbon model of hemoglobin shows all four heme groups, also in red, held in place by the molecule’s coils.
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3.2 From Structure to Function The function of organic molecules in biological systems begins with their structure The building blocks of carbohydrates, lipids, proteins, and nucleic acids bond together in different arrangements to form different kinds of complex molecules
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This note was uploaded on 04/02/2012 for the course BIO 100 taught by Professor Corbet during the Spring '12 term at Paradise Valley Community College .

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chapter3_part1 - Molecules of Life Chapter 3 Part 1...

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