Biomolecules Test

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Biomolecules Test - 3

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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

Glycogen is a branched chain polymer of αD glucose units in which chain is formed by C₁ −C₄ glycosidic linkage whereas branchin occurs by the formation of C₁ −C₆ glycosidic linkage. Structure of glycogen can be shown below similar to the sturcture amplopectin.
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

If blood glucose levels become too low, glucagon (pancreatic hormone) is released, which causes the liver to convert the stored glycogen back into glucose, and release it into the bloodstream.
Question 3
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Sucrose (cane sugar) is a disaccharide. One molecule of sucrose on hydrolysis gives _________.

A
2 molecules of glucose

B
2 molecules of glucose + 1 molecule of fructose

C
1 molecule of glucose + 1 molecule of fructose

D
2 molecules of fructose
Question 4
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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

In α-helix, hydrogen bonds are present between –NH group of one amino acid residue to the >C= O group of another aminoacid residue.
Question 5
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Which of the following is NOT a culinary use of oil in the food industry?

A
Flavor

B
Texture

C
Softening

D
Shortening

Solution

Flavor, texture and shortening are all major culinary uses of oil in the food industry.
Question 6
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Dinucleotide is obtained by joining two nucleotides together by phosphodiester linkage. Between which carbon atoms of pentose sugars of nucleotides are these linkages present?

A
5 ′and 3 ′

B
1 ′and 5 ′

C
5 ′and 5 ′

D
3 ′and 3 ′

Solution

The correct answer is option A
Nucleotides are joined together by phosphodiester linkage between 5 ′and 3 ′carbon atoms of pentose sugar.
Question 7
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Nucleic acids are the polymers of ______________.

A
Nucleosides

B
Nucleotides

C
Bases

D
Sugars

Solution

Nucleotides are organic molecules that serve as the monomer units for forming the nucleic acid polymers deoxyribonucleic acid and ribonucleic acid, both of which are essential biomolecules within all life-forms on Earth.
Question 8
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Which of the following statements is not true about glucose?

A
It is an aldohexose.

B
On heating with HI it forms n-hexane.

C
It is present in furanose form.

D
It does not give 2,4-DNP test.

Solution

The correct answer is Option C.
Glucose is an aldohexose having structural formula.

Glucose on heating with HI produces n hexane.
C₆ H₁₂ O₆_--HI →C₆ H₁₄
Glucose does not give 2,4. DNP test due to its existence as cyclic structure shown below :

It is present in pyranose form, as shown below

Pyranose means pyran (membered ring containing oxygen) like structure.
Question 9
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Each polypeptide in a protein has amino acids linked with each other in a specific sequence. This sequence of amino acids is said to be ____________.

A
primary structure of proteins.

B
secondary structure of proteins.

C
tertiary structure of proteins.

D
quaternary structure of proteins.

Solution

The primary structure of a protein refers to the sequence of amino acids in the polypeptide chain. The primary structure is held together by peptide bonds that are made during the process ofprotein biosynthesis.
Question 10
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DNA and RNA contain four bases each. Which of the following bases is not present in RNA?

A
Adenine

B
Uracil

C
Thymine

D
Cytosine

Solution

Thymine is one of the four nucleobases in the nucleic acid of DNA that are represented by the letters G –C –A –T. The others are adenine, guanine, and cytosine. Thymine is also known as 5-methyluracil, a pyrimidine nucleobase. In RNA, thymine is replaced by the nucleobase uracil.

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Biomolecules Test - 3

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Biomolecules Test - 3

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Question 1

Amylose

Amylopectin

Cellulose

Glucose

Solution

Question 2

Amylose

Cellulose

Amylopectin

Glycogen

Solution

Question 3

2 molecules of glucose

2 molecules of glucose + 1 molecule of fructose

1 molecule of glucose + 1 molecule of fructose

2 molecules of fructose

Question 4

Peptide bonds

van der Waals forces

Hydrogen bonds

Dipole-dipole interactions

Solution

Question 5

Flavor

Texture

Softening

Shortening

Solution

Question 6

5 ′and 3 ′

1 ′and 5 ′

5 ′and 5 ′

3 ′and 3 ′

Solution

Question 7

Nucleosides

Nucleotides

Bases

Sugars

Solution

Question 8

It is an aldohexose.

On heating with HI it forms n-hexane.

It is present in furanose form.

It does not give 2,4-DNP test.

Solution

Question 9

primary structure of proteins.

secondary structure of proteins.

tertiary structure of proteins.

quaternary structure of proteins.

Solution

Question 10

Adenine

Uracil

Thymine

Cytosine

Solution

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