Lecture - Sep 21 - Biology Lecture Chapter 5 Test your...

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September 21, 2009 Biology Lecture Chapter 5 – “Test your understanding” 7e 8a 10a 11e 12a 13c 14b Sucrose C 12 H 22 O 11 Glucose C 6 H 12 O 6 Fructose C 6 H 12 O 6 Storage Polysaccharide Starch- made up of glucose subunits, found in plants. Hydrogen bonds stabilize helical structure of the starch. Structural Polysaccharide (example: cellulose) Dissolved in water, the glucose molecules can form a chain or a ring. It’s just a rearrangement of the atoms that allows it to form a ring. There are two ways to form a ring, in solution. There’s glucose in linear form, when turned around it gets ready to form a ring. alpha – glucose and beta – glucose. cellulose is composed of beta glucose subunits. starch is composed of alpha glucose subunits. Hydrogen bonding in cellulose fibrals help them be strong. Proteins – work forces of the cell - polypeptides – long polymers of amino acids (monomers) joined by peptide bonds - many functions: - enzymes (virtually all enzymes are proteins) - structural components - cell regulators – certain whore moans. Amino acid – ionizes as a zwitterions – a very strange kind of dipole ion - characterized by their side chains. - amino group and carboxyl group non-polar amino acids: hydrocarbons polar amino acids: hydroxyl group Acidic amino acids: carboxyl group part of the side chain
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Basic amino acids: amino group that’s part of the side chain Peptide bond formation: a covalent bond.
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