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Lecture_5_4_09 - Chapter 24 Synthetic and Biologial...

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Chapter 24: Synthetic and Biologial Polymers
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Biological Membranes Amphiphilic lipids form membrane Polar head group and non-polar tail interact to minimize energy by maximizing hydrophobic and hydrophillic interactions Lipids tend to form a bilayer driven by entropy Proteins can be found on or in membranes (Singer-Nicholson fluid mosaic model) Membrane allows cell to keep inside and outside environments distinct
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Transport through a Membrane Membrane transport can occur through lipids or through proteins Water transport occurs through aquaporins Change in osmotic pressure can result in cell shrinking or swelling
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Carbohydrates As name suggests, these can be thought of as hydrates of carbon [C x (H 2 O) x or C x H 2x O x ] Nomenclature: Commonly end in “-ose” or are referred to as saccharides Carbohydrates can exist as monomers, dimers, oligomers, and polymers
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Monosaccharides Glucose: formula is C 6 H 12 O 6 Chain form is shown at right for D-
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