Biomolecules Test

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Biomolecules Test - 13

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Weekly Quiz Competition

Question 1
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Glycogen is a branched chain polymer of α-D-glucose units in which chain is formed by C₁—C₄ glycosidic linkage whereas branching occurs by the formation of C₁−C₆ glycosidic linkage. Structure of glycogen is similar to __________.

A
Amylose

B
Amylopectin

C
Cellulose

D
Glucose

Solution

Polysaccharides contain a large number of monosaccharide units joined together by glycosidic linkages. These are the most commonly encountered carbohydrates in nature. Amylopectin is insoluble in water and constitutes about 80-85% of starch. It is a branched chain polymer of alpha-D-glucose units in which chain is formed by C₁−C₄ glycosidic linkage whereas branching occurs by C₁−C₆ glycosidic linkage.
Question 2
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Which of the following polymer is stored in the liver of animals?

A
Amylose

B
Cellulose

C
Amylopectin

D
Glycogen

Solution

The carbohydrates are stored in animal body as glycogen. It is also known as animal starch because its structure is similar to amylopectin and is rather more highly branched. It is present in liver, muscles and brain.
Question 3
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Proteins are found to have two different types of secondary structures viz. α-helix and β-pleated sheet structure. α-helix structure of protein is stabilised by :

A
Peptide bonds

B
van der Waals forces

C
Hydrogen bonds

D
Dipole-dipole interactions

Solution

α-helix and β-pleated sheet structure: These structures arise due to the regular folding of the backbone of the polypeptide chain due to hydrogen bonding between >C—O and —NH— group of the peptide bond. α-Helix is one of the most common ways in which a polypeptide chain forms all possible hydrogen bond by twisting into a right-handed screw (helix) with the -NH group of each amino acid residue hydrogen bonded to the >C = O of an adjacent turn of the helix.
Question 4
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Which of the following acids is a vitamin?

A
Aspartic acid

B
Ascorbic acid

C
Adipic acid

D
Saccharic acid

Solution

Vitamin C is also known as Ascorbic acid.
Question 5
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Nucleic acids are the polymers of ______________.

A
Nucleosides

B
Nucleotides

C
Bases

D
Sugars

Solution

Nucleic acids are long chain polymers of nucleotides, so they are also called polynucleotides.