Chem 471 | Problem Set 7 | Due Mon Mar 29 2010

When two carbohydrates are epimers:

1. one is a pyranose, the other a furanose.
2. one is an aldose, the other a ketose.
3. they differ in length by one carbon.
4. they differ only in the configuration around one carbon atom.
5. they rotate plane-polarized light in the same direction.

Which of following is an anomeric pair?

1. D-glucose and D-fructose
2. D-glucose and L-fructose
3. D-glucose and L-glucose
4. α-D-glucose and β-D-glucose
5. α-D-glucose and β-L-glucose

When the linear form of glucose cyclizes, the product is a(n):

1. anhydride.
2. glycoside.
3. hemiacetal.
4. lactone.
5. oligosaccharide.

Which of the following is not a reducing sugar?

1. Fructose
2. Glucose
3. Glyceraldehyde
4. Ribose
5. Sucrose

From the abbreviated name of the compound Gal(β1 → 4)Glc, we know that:

1. C-4 of glucose is joined to C-1 of galactose by a glycosidic bond.
2. the compound is a D-enantiomer.
3. the galactose residue is at the reducing end.
4. the glucose is in its pyranose form.
5. the glucose residue is the β anomer.

Starch and glycogen are both polymers of:

1. fructose.
2. glucose1-phosphate.
3. sucrose.
4. α-D-glucose.
5. β-D-glucose.

Which of the following is a heteropolysaccharide?

1. Cellulose
2. Chitin
3. Glycogen
4. Hyaluronate
5. Starch

The basic structure of a proteoglycan consists of a core protein and a:

1. glycolipid.
2. glycosaminoglycan.
3. lectin.
4. lipopolysaccharide.
5. peptidoglycan.

In glycoproteins, the carbohydrate moiety is always attached through the amino acid residues:

1. asparagine, serine, or threonine.
2. aspartate or glutamate.
3. glutamine or arginine.
4. glycine, alanine, or aspartate.
5. tryptophan, aspartate, or cysteine.

The biochemical property of lectins that is the basis for most of their biological effects is their ability to bind to:

1. amphipathic molecules.
2. hydrophobic molecules.
3. specific lipids.
4. specific oligosaccharides.
5. specific peptides.