Biomolecules Test

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Biomolecules Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

The chemical name of vitamin C is

A
citric acid

B
acetic acid

C
ascorbic acid

D
oxalic acid

Solution

The chemical name of vitamin C is ascorbic acid.
Question 2
1 / -0

Identify the incorrect statement regarding vitamin B₁.

A
It is a fat-soluble vitamin.

B
It is also known as thiamine.

C
Its deficiency causes beriberi.

D
It is a sulphur-containing vitamin.

Solution

B-complex vitamin and vitamin C are water-soluble vitamins.
Question 3
1 / -0

The disease beriberi is caused by the deficiency of vitamin

A
A

B
K

C
B₁

D
B₁₂

Solution

Beriberi is a disease in which the body does not have enough thiamine or vitamin B₁. Beriberi is also a nutritional disorder and it is characterised by impairment of the nerves and heart.
Question 4
1 / -0

Denaturation of proteins involves breakdown of

A
primary structure only

B
secondary structure only

C
primary, secondary and tertiary structures

D
secondary, tertiary and quaternary structures

Solution

Denaturation of proteins involves the disruption and possible destruction of secondary, tertiary and quaternary structures.
Question 5
1 / -0

Which of the following statements is not correct?

A
Cyclisation of glucose results into two structures of pyranose, known as anomers.

B
The two anomers of pyranose have different specific rotations of polarised light.

C
Specific rotation of α -D-glucose is + 112.2°.

D
Specific rotation of β -D-glucose is + 52.7°.

Solution

Specific rotation of β-D-glucose is + 18.7°, but an equilibrium mixture of α-D-glucose and β-D-glucose has specific rotation equal to + 52.7°.
Question 6
1 / -0

Directions For Questions

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

...view full instructions

Which of the following is a disaccharide?

A
Lactose

B
Starch

C
Glucose

D
Cellulose

Solution

Lactose is a disaccharide found in milk. It is composed of ± - D - galactose and ± - D - glucose.
Question 7
1 / -0

Neutral amino acids are least soluble in water

A
at pH = 7

B
at pH > 7

C
at pH < 7

D
at isoelectric point

Solution

An amino acid shows the lowest solubility in a solution at the isoelectric point since at this pH the solution has the highest concentration of dipolar ions. As the solution is made more alkaline or more acidic, the concentration of one of the more soluble ions, e.g. H₃⁺NCHRCOOH or H₂NCHRCOO^-, increases.

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Biomolecules Test - 3

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Biomolecules Test - 3

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Question 1

citric acid

acetic acid

ascorbic acid

oxalic acid

Solution

Question 2

It is a fat-soluble vitamin.

It is also known as thiamine.

Its deficiency causes beriberi.

It is a sulphur-containing vitamin.

Solution

Question 3

A

K

B1

B12

Solution

Question 4

primary structure only

secondary structure only

primary, secondary and tertiary structures

secondary, tertiary and quaternary structures

Solution

Question 5

Cyclisation of glucose results into two structures of pyranose, known as anomers.

The two anomers of pyranose have different specific rotations of polarised light.

Specific rotation of α -D-glucose is + 112.2°.

Specific rotation of β -D-glucose is + 52.7°.

Solution

Question 6

Lactose

Starch

Glucose

Cellulose

Solution

Question 7

at pH = 7

at pH > 7

at pH < 7

at isoelectric point

Solution

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B₁

B₁₂