Answ_toCHO_Chapter_7

Answ_toCHO_Chapter_7 - ANSWERS TO QUESTIONS OF Chapter 7 Carbohydrates and Glycobiology 1 a aldose b 2 epimers c aldose d anomers e ketose f 4

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ANSWERS TO QUESTIONS OF Chapter 7. Carbohydrates and Glycobiology. 1) a) aldose b) 2’ epimers c) aldose d) anomers e) ketose f) 4’ epimers g) ketose 2) Enantiomers or enantiomorphs are mirror image structures such as L-glucose and D- glucose; L-ribulose and D ribulose. 3) Sugars containing a free aldehyde or keto group can reduce for eg., cupric ion, Cu +2 to cuprous ion, Cu +1 . The reducing agent is the open chain form of the aldose or ketose which is in equilibrium with the cyclic chain structure. Reducing sugars, eg., glucose, fructose, maltose, lactose; non-reducing sugars, sucrose, trehalose. Another form of a non-reducing sugar could be methyl-D-glucoside glucose. Ketoses can be methylated to form a glycoside which would also be a non-reducing sugar. Do you know other non- reducing sugars? What about aldonic acids? Gluconic acid would also be a non reducing sugar while glucuronic acid would be a reducing sugar. Why? 4) alpha D-glucose <======> beta D-glucose
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This note was uploaded on 04/02/2008 for the course BMB 461 taught by Professor Stoltzfus during the Spring '07 term at Michigan State University.

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Answ_toCHO_Chapter_7 - ANSWERS TO QUESTIONS OF Chapter 7 Carbohydrates and Glycobiology 1 a aldose b 2 epimers c aldose d anomers e ketose f 4

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