chemistry

Bakersfield College Wade Ellis

Carbohydrates Problem Set Name:_________________________ Chem B11 Part A: Drawing Monosaccharides

1. Draw the Fischer Projections for the following carbohydrates.

D-Glucose

L-Glucose

D-Galactose

L-Galactose

D-Fructose

L-Fructose

Questions:

a. What is the difference between the D- and L- isomers of these carbohydrates?

b. How does the structure of D-Glucose compare with D-Galactose?

Bakersfield College Wade Ellis

2. Draw the Haworth Projections of the following carbohydrates.

α-D-Glucose

β-D-Glucose

α-D-Galactose

α-D-Fructose

Part 2: Structures of Disaccharides 1. Draw the structure of α-maltose

2. Write out the reaction for the hydrolysis of α-maltose. Questions:

a. What would cause a disaccharide like maltose to be hydrolyzed in our bodies?

b. Why can some disaccharides have both α and β forms while others cannot?

Bakersfield College Wade Ellis

Part 3: Polysaccharides Draw the structures of the following polysaccharides. Show at least four monomer units in the drawing.

1. Amylose

2. Amylopectin

3. Cellulose Questions:

a. All of these polysaccharides are made of glucose. What causes the differences in their biochemical properties?

b. Compare the structures of the three polysaccharides listed above. How are they different from one another?