Lecture 13.Feb19 - BIO 311C Spring 2010 Your Exam will be...

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BIO 311C Spring 2010 Lecture 13 – Friday 19 Feb. Your Exam will be returned during your discussion period today and on Monday. Rebecca will go over Exam questions as requested during the discussion periods. 1
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CHO CH 2 OH An Abbreviated Way of Showing the Structural Formula of D-glucose * Review 4
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Ways of representing α -D-glucose Ways of representing β -D-glucose 1 6 6 1 * The "OH" on the disguised aldehyde or ketone functional group is written downward for α -sugars and is written up for β -sugars. β α 6
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The ring form of a sugar is often shown in an abbreviated form. α -D-glucose In the abbreviated form: - the points where lines intersect represent carbon atoms; - the hydrogen atoms on carbon atoms 1 - 5 are not shown; and - the OH groups on carbon atoms 2 - 4 are shown only as vertical straight lines. * abbreviated form 7
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A modified sugar is a molecule that resembles a simple sugar, but with some modification Example: D-glucose a simple sugar 2-amino-D-glucose a modified sugar * Typically only one functional group of a simple sugar is altered in a modified sugar. 8
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α -D-ribose 2-deoxy- α -D-ribose α -D-glucose 2-amino- α -D-glucose α -D-glucose-6-phosphate Some important modified sugars in cells * remove oxygen atom 9
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* Illustration and Description of a Polymer Representation of a polymer monomers bonding arrangement Polymers are large molecules that are characterized by: - many identical (or very similar) small molecules called monomers that are chemically bonded together - a characteristic kind of chemical bonding holding the monomers together. Most monomers that are used to form polymers in living cells have an H atom and an OH functional group that are removed during polymer formation.
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