BMB_461_CHO_HW_q - (a α-D-glucose β-L-glucose...

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PROBLEMS PERTAINING TO CHEMISTRY OF SUGARS & POLYSACCHARIDES. Chapter 7, Lehninger 1) Indicate whether each of the following pairs of sugars consists of anomers, epimers or an aldose or ketose. (a)D-glyceraldehyde (b) D-glucose and D-mannose (c) D-glucose (d) ( α )-glucose and ( β )-D-glucose (e) dihydroxyacetone (g) D-Fructose 2) What are enantiomers, aldoses and ketoses.? Give two examples (sugars) of each. 3) What is meant by a reducing sugar? List 3 sugars that are reducing sugars and 2 that are non-reducing sugars. 4) What does the enzyme mutarotase catalyze? Show by an equation using the glucose isomers. 5) By Haworth projection show the structure of the following sugars.
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Unformatted text preview: (a) α-D-glucose, β-L-glucose, β-D-mannose, α-D-galactose, β-2-deoxy D-ribose and α-D-fructose. Two of them are predominantly in the furanose structure and the rest in the pyranose structure. 6) What are boat and chair forms? Show the structures of the α and β anomers of D-glucopyranose. What is meant by equatorial and axial groups? 7) Give two examples of aminosugars and aldonic sugars. 8) What are glycosides? disaccharides? polysaccharides? Give examples of each. 9) What are the primary structures of cellulose, amylose, glycogen, chitin and amylopectin? Where are these polysaccharides usually found?...
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