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ExtraCreditHomework5KEY(1) - Name KEY EID Extra Credit...

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Name: KEY EID: Extra Credit Homework #5 Complete questions below and hand in to a TA by the end of class, Mon., Oct. 3. 1. Stevioside is a natural product found in some plant leaves. It is 40-300 times sweeter than sucrose despite being non-caloric, and therefore is used as an artificial sweetener for diabetics in some countries (although the health affects of stevioside are still hotly debated). a) Would stevioside test positive in Fehling’s reaction (the qualitative test for a reducing sugar)? No b) What is the linkage between the monosaccharide residues? (hint: the linkage in amylose is “ α 1 4”) β 1 2
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2. Consider galactose. a) Draw the ring-closing reaction that forms β -D-galactopyranose (start with a Fischer projection formula and end with a Haworth perspective formula). C C OH C H HO H C H HO H O C OH H CH 2 OH OH CH 2 OH OH OH O H OH O CH 2 OH OH OH H OH OH (+ proton transfer)
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b) Design a binding site for β -D-galactopyranose within a protein. Illustrate how the
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