Lecture 3 - Lecture 3 Polysaccharides"Complex carbohydrates polymers of monosaccharides-Function in energy storage(starch glycogen or structural

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Lecture 3 Polysaccharides: “Complex carbohydrates” polymers of monosaccharides -Function in energy storage (starch, glycogen) or structural support (chitin, cellulose) Lipids Hydrophobic/Nonpolar; don’t mix with water. Fats, oils and waxes Steroids Dietary fats are triglycerides, come from beef, vegetable oils, etc. Formed from 3 fatty acids and a glycerol -Glycerol: 3-carbon alcohol, each with OH group -Fatty acid: carbon chain with COOH group. Fats: Saturated Vs. Unsaturated Saturated : all C-atoms bonded to max # H-atoms -Animal fats, tropical plant oils (cocoa, palm) -Linear shape, allows compact storage. -High melting point, solid at room temperature Unsaturated : Some C=C double bonds -Plant oils, fish fats ---Some (omega-3 fatty acids) actually beneficial -Bent fatty acid, less compact storage -Lower melting point, liquid at room temperature. Hydrogenated : “trans fats” or “partially hydrogenated oil” -Artificially added H atoms -Remain solid at room temp -Used in snack foods -Bad for our health. Steroids -Hydrophobic so are classified as lipids -Complex ring form of carbon skeleton -Cholesterol is the “base” form -Building block for complex steroids -Found in membranes -Some are hormones –e.g. Sex hormones -Anabolic steroids -Illegal synthetic drugs, mimic effects of testosterone -Can cause major health problems. Proteins -Amino acids polymers (chains of amino acids) ---Different sequences of amino acids make different proteins -Shape important to function -Many functions: storage, structural, contractile, transport, defensive, signal Levels of Protein Structure
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Primary : The amino acid sequence Secondary: Coiling and/or folding of the amino acid chain -Determined by H-bonds -Coils are called alpha helices
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This note was uploaded on 05/11/2008 for the course BIO 101 taught by Professor Lanno during the Spring '08 term at Ohio State.

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Lecture 3 - Lecture 3 Polysaccharides"Complex carbohydrates polymers of monosaccharides-Function in energy storage(starch glycogen or structural

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