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AP Biology 2005-2006 Chapter 5. Macromolecules
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AP Biology 2005-2006 Macromolecules Smaller organic molecules join together to form larger molecules macromolecules 4 major classes of macromolecules: carbohydrates lipids proteins nucleic acids
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AP Biology 2005-2006 Polymers Long molecules built by linking chain of repeating smaller units polymers monomers = repeated small units covalent bonds
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AP Biology 2005-2006 How to build a polymer Condensation reaction dehydration synthesis joins monomers by “taking” H 2 O out 1 monomer provides OH the other monomer provides H together these form H 2 O requires energy & enzymes
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AP Biology 2005-2006 How to break down a polymer Hydrolysis use H 2 O to break apart monomers reverse of condensation reaction H 2 O is split into H and OH H & OH group attach where the covalent bond used to be ex: digestion is hydrolysis
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AP Biology 2005-2006 Carbohydrates
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AP Biology 2005-2006 Carbohydrates Carbohydrates are composed of C, H, O carbo - hydr - ate CH 2 O (CH 2 O) x C 6 H 12 O 6 Function: energy u energy storage raw materials u structural materials Monomer: sugars ex: sugars & starches
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AP Biology 2005-2006 Sugars Most names for sugars end in -ose Classified by number of carbons 6C = hexose (glucose) 5C = pentose (fructose, ribose) 3C = triose (glyceraldehyde)
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AP Biology 2005-2006 What functional groups? carbonyl ketone aldehyde hydroxyl
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AP Biology 2005-2006 Sugar structure 5C & 6C sugars form rings in aqueous solutions in cells! Carbons are numbered
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AP Biology 2005-2006 Numbered carbons C CC C C C 1' 2'3' 4' 5' 6' O
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AP Biology 2005-2006 Simple & complex sugars Monosaccharides simple 1 monomer sugars glucose Disaccharides 2 monomers sucrose Polysaccharides large polymers starch
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AP Biology 2005-2006 Building sugars Dehydration synthesis | glucose | glucose glycosidic linkage monosaccharidesdisaccharide | maltose
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AP Biology 2005-2006 Building sugars Dehydration synthesis | fructose | glucose glycosidic linkage monosaccharidesdisaccharide | sucrose structural isomers
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AP Biology 2005-2006 Polysaccharides Polymers of sugars costs little energy to build easily reversible = release energy Function: energy storage starch (plants) glycogen (animals) building materials = structure cellulose (plants) chitin (arthropods & fungi)
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AP Biology 2005-2006 Branched vs linear polysaccharides
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AP Biology 2005-2006 Polysaccharide diversity Molecular structure determines function isomers of glucose How does structure influence function…
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AP Biology 2005-2006 Digesting starch vs. cellulose
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AP Biology 2005-2006 Cow can digest cellulose well; no need to eat supplemental sugars Gorilla can’t digest cellulose well; must supplement with sugar source, like fruit
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AP Biology 2005-2006 Cellulose Most abundant organic compound on Earth
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AP Biology 2005-2006 Glycemic index Which food will get into your blood more quickly? apple rice cakes corn flakes bagel peanut M&M
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AP Biology 2005-2006 Glycemic index Ranking of carbohydrates based on their immediate effect on blood glucose (blood sugar) levels Carbohydrate foods that breakdown quickly during digestion have the highest glycemic indices. Their blood sugar response is fast & high.
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AP Biology 2005-2006 Glycemic index Which food will get into your blood more quickly? apple36 rice cakes82 corn flakes84 bagel72 peanut M&M33
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