Biomolecules Test

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Biomolecules Test - 7

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Weekly Quiz Competition

Question 1
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Which of the following pairs is NOT correctly matched?

A
Retinol : Vitamin A

B
Thiamine : Vitamin B₂

C
Calciferol : Vitamin D

D
Biotin : Vitamin H

Solution

Vitamin B₂ is also referred to as riboflavin, not thiamine.
Question 2
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Directions For Questions

The following question has four choices, out of which ONLY ONE is correct.

...view full instructions

Which of the following statements about fructose is not correct?

A
Fructose reacts with five molecules of acetic anhydride to give a penta-acetate.

B
It is oxidised by nitric acid to give a mixture of trihydroxy glutaric, tartaric and glycolic acids.

C
Fructose is not oxidised by bromine water.

D
With excess of phenylhydrazine, it gives an osazone completely different from glucosazone.

Solution

Fructose gives the same osazone as glucose. So, (4) is incorrect and hence, it is the correct answer.
Question 3
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Which of the following statements is true for amino acids?

A
Amino acids are non-volatile crystalline solids, which melt with decomposition at high temperatures.

B
They are soluble in both polar and non-polar solvents.

C
Their aqueous solutions behave like solutions of low dipole moments.

D
Acidity constant of –COOH and basicity constant of –NH₂groups bear reciprocalrelationship.

Solution

Amino acids exist as zwitterions form internal salts. Hence, they are non-volatile crystalline solids, which melt with decomposition at high temperatures.
Hence, option (1) is correct.
They are soluble in polar solvents and insoluble in non–polar solvents.
Since they remain as dipolar substances in aqueous solution, their dipole moments are high.
Acidity and basicity constants of both –COOH and –NH₂groups are low.
Question 4
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Which of the following statements is not true?

A
Almost all α-amino acids are optically active.

B
Glycine is optically inactive.

C
All naturally occurring α-amino acids have D–configuration.

D
All α-amino acids are amphoteric in nature.

Solution

All natural α-amino acids have L-configuration.
So, (3) is false and hence, it is the correct answer.
Question 5
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What is the maximum number of monosaccharides that can be obtained by hydrolysis of one molecule of oligosaccharide?

A
3

B
5

C
7

D
10

Solution

Oligosaccharides are the carbohydrates that yield 2-10 monosaccharide units on hydrolysis. They are classified as disaccharides, trisaccharides, tetrasaccharides etc., depending upon the number of monosaccharides they provide on hydrolysis.

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Biomolecules Test - 7

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Biomolecules Test - 7

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Question 1

Retinol : Vitamin A

Thiamine : Vitamin B2

Calciferol : Vitamin D

Biotin : Vitamin H

Solution

Question 2

Fructose reacts with five molecules of acetic anhydride to give a penta-acetate.

It is oxidised by nitric acid to give a mixture of trihydroxy glutaric, tartaric and glycolic acids.

Fructose is not oxidised by bromine water.

With excess of phenylhydrazine, it gives an osazone completely different from glucosazone.

Solution

Question 3

Amino acids are non-volatile crystalline solids, which melt with decomposition at high temperatures.

They are soluble in both polar and non-polar solvents.

Their aqueous solutions behave like solutions of low dipole moments.

Acidity constant of –COOH and basicity constant of –NH2 groups bear reciprocal relationship.

Solution

Question 4

Almost all α-amino acids are optically active.

Glycine is optically inactive.

All naturally occurring α-amino acids have D–configuration.

All α-amino acids are amphoteric in nature.

Solution

Question 5

3

5

7

10

Solution

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Thiamine : Vitamin B₂

Acidity constant of –COOH and basicity constant of –NH₂groups bear reciprocalrelationship.