Biochemistry Questions and Answers Part-17

1. Which of the following is an example of bacterial and yeast polysaccharide?
a) Starch
b) Glycogen
c) Cellulose
d) Dextrans

Answer: d
Explanation: Dental plaque formed by bacteria on the surface of teeth is rich in dextrans.

2. In which of the following, glucose residues are linked by β1 &arr; 4 glycosidic bonds?
a) Amylose
b) Starch
c) Cellulose
d) Glycogen

Answer: c
Explanation: The glucose residues in cellulose are linked by β1 &arr; 4 glycosidic bonds, in contrast to the α1 &arr; 4 bonds of amylose, starch and glycogen.

3. What is the chemical difference between cellulose and chitin?
a) Replacement of the hydroxyl group at C2 with an acetylated amino group
b) Replacement of the hydroxyl group at C3 with an acetylated amino group
c) Replacement of the hydroxyl group at C4 with an acetylated amino group
d) Replacement of the hydroxyl group at C5 with an acetylated amino group

Answer: a
Explanation: Chitin is a linear homopolysaccharide composed of N-acetylglucosamine residues in β linkage.

4. When all the monosaccharides in a polysaccharide are same type, such type of a polysaccharide is called a ___________
a) Glycogen
b) Homoglycan
c) Heteroglycan
d) Oligosaccharide

Answer: b
Explanation: Homoglycan is a polysaccharide where all the monosaccharides are same type.

5. In which of the following forms, glucose is stored in plants?
a) Glycogen
b) Starch
c) Dextrin
d) Cellulose

Answer: b
Explanation: Starch is the storage form of glucose in plants.

6. In which of the following forms, glucose is stored in the liver?
a) Glycogen
b) Starch
c) Dextrin
d) Cellulose

Answer: a
Explanation: Glucose in the form of glycogen is stored in the liver and muscles.

7. Which of the following are the storage polysaccharides?
a) Glycogen
b) Cellulose
c) Chitin
d) Glucose

Answer: a
Explanation: Starch and glycogen are known as storage polysaccharides.

8. Which of the following are the structural polysaccharides?
a) Glycogen
b) Starch
c) Chitin
d) Glucose

Answer: c
Explanation: Chitin and cellulose are known as structural polysaccharides.

9. Which of the following is an analogous to starch?
a) Cellulose
b) Glycogen
c) Sucrose
d) Chitin

Answer: b
Explanation: Glycogen is also known as animal starch.

10. Which of the following is not a monosaccharide with 5 carbon atoms?
a) Arabinose
b) Xylulose
c) Trehalose
d) Ribulose

Answer: c
Explanation: Trehalose is a disaccharide.