91Ó°ÊÓ

Gentiobiose is found in saffron.$(13.4,13.5,13.6)$

a. Gentiobiose contains two glucose molecules linked by a $\mathrm{β}(1→6)$-glycosidic bond. Draw the Haworth structure for $\mathrm{β}$-gentiobiose.

b. Is gentiobiose a reducing sugar? Explain.

Identify the Fischer projection A to D that matches each of the following: (13.1, 13.3)

a. the L enantiomer of mannose

b. a ketopentose

c. an aldopentose

d. a ketohexose

What are the functional groups and number of carbons in an aldohexose?

Classify each of the following monosaccharides as an aldopentose, ketopentose, aldohexose, or ketohexose:

a. Psicose is present in low amounts in foods.

b. Lyxose is a component of bacterial glycolipids.