Becker's World of the Cell 9th Edition by Lewis Kleinsmith, Jeff Hardin, Gregory Paul Bertoni

Exercise 10

Carbohydrate Structure. From the following descriptions of gentiobiose, raffmose, and a dextran, draw Haworth projections of each:
(a)Gentiobiose is a disaccharide found in gentians and other plants. It consists of two molecules of -D-glucose linked to each other by a (1 6)glycosidic bond.
(b)Raffinose is a trisaccharide found in sugar beets. It consists of one molecule each of -D-galactose, -D-glucose, and -D-fructose, with the galactose linked to the glucose by an (l 6)glycosidic bond and the glucose linked to the fructose by an (l 2)bond.
(c)Dextrous are polysaccharides produced by some bacteria. They are polymers of a-D-glucose linked by (l 6)glycosidic bonds, with frequent a(l 3)branching. Draw a portion of a dextran, including one branch point.