1. Identify each of the following: a) Two aldoses whose configuration at carbons 3, 4, and 5 coincides with D-fructose. b) The enantiomer of D-galactose. c) An epimer of D-galactose that is also an epimer of D-mannose. d) A ketose that does not have chiral centers. e) A ketose that has only one chiral center. f) Residues of cellulose monosaccharide, amylose and glycogen. g) Chitin monosaccharide residues. 2. Draw Fischer projections for: a) L-mannose, b) L-fucose (6-deoxy-L-galactose), c) D-xylitol, and d) D-iduronate. 3. Describe the general structural properties of glycosaminoglycans. Please let it be on the computer, because then I don't understand, and these exercises I don't know how to do them