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Chapter 8: Q2P. (page 243)
Are (a) D-glucitol, (b) D-galactitol, and (c) D-glycerol optically active?
D-glycerol is optically active. Hence, the correct answer is option (c).
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Glycogen is treated with dimethyl sulfate, which adds a methyl group to every free OH group. Next, the molecule is hydrolyzed to break all the glycosidic bonds between glucose residues. The reaction products are then chemically analyzed. (a) How many different types of methylated glucose molecules are obtained? (b) Draw the structure of the one that is most abundant.
Brown algae produce alginate, a polysaccharide containing 尾-D mannuronate linked 1鈫�4 to its C5 epimer 伪-L-guluronate. Draw the structure of an alginate disaccharide.
Explain the difference between N- and O-linked oligosaccharides.
Calculate the chemical potential difference when intracellular [Na+] = 10 mM and extracellular [Na+] = 150 mM at 37掳C. (b) What would the electrochemical potential be if the membrane potential were -60 mV (inside negative)?
Some bacteria produce thiosugars, which contain a C鈥擲 covalent bond, such as 2-deoxy-2-thio-尾-D-glucose. Draw the structure of this sugar.
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