Biomolecules Test

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Biomolecules Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is true about vitamins?

A
Vitamins are needed in large amounts in the human body.

B
Vitamins are secreted by ductless glands.

C
Vitamins are synthesised by an organism.

D
Vitamins A, D, E and K are fat-soluble vitamins.

Solution

Vitamins are needed in very small quantities and are not synthesised by organisms.
Vitamins A, D, E and K are fat-soluble, while vitamins of B group and vitamin C are water-soluble.
Question 2
1 / -0

Which of the following statements is not correct?

A
Vitamin A is also known as retinol.

B
In carrots, a red coloured compound (carotene) breaks into vitamin C in the body.

C
Vitamin A is essential for growth and vision.

D
Vitamins of B and vitamin C are water-soluble.

Solution

In carrots, a red coloured compound (carotene) breaks down into vitamin A in the body.
Question 3
1 / -0

The disease pernicious anaemia is caused by the deficiency of

A
vitamin A

B
vitamin K

C
vitamin B₁

D
vitamin B₁₂

Solution

Pernicious anaemia is a deficiency in the production of red blood cells due to lack of vitamin B₁₂.
Question 4
1 / -0

The deficiency of vitamin D causes

A
beriberi

B
rickets

C
anaemia

D
scurvy

Solution

Rickets is a disease of children caused by vitamin D deficiency. It is characterised by imperfect calcification, softening and distortion of the bones, typically resulting in bow legs.
Question 5
1 / -0

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

Out of 20 amino acids which are required for protein synthesis, human body can synthesise

A
12

B
9

C
8

D
7

Solution

The body requires 20 different amino acids of which 8 are referred to as essential amino acids which cannot be synthesised by the human body. There are 12 amino acids which can be made by the body and are called the non-essential amino acids.
Question 6
1 / -0

Which of the following statements is incorrect about peptide bond (-CO-NH-)?

A
C-N bond length of peptide linkage is longer than usual bond length of C-N bond.

B
C-N bond length in protein is smaller than the usual bond length of the C-N bond.

C
Spectroscopic analysis shows planar nature of -CO-NH- group.

D
Peptides are formed by interaction of amino groups and carboxyl groups of amino acids.

Solution

C-N bond length of peptide linkage is 1.32A^o, which is smaller than 1.47A^o, the normal C-N bond length. Option 1 is an incorrect statement as the length is not longer, but shorter than usual bond length of C-N bond.

The statements in all the other options are correct.
Question 7
1 / -0

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

Which of the following facts about fructose is wrong?

A
It forms an oxime with hydroxylamine.

B
It can be reduced to a hexahydric alcohol.

C
It reacts with 5 moles of acetic anhydride to give penta acetate.

D
It is oxidised by bromine water giving an acid with six carbon atoms.

Solution

It has a carbonyl group, but no aldehydic group. So, it is not oxidised by mild oxidising agents like bromine water to give an acid with the same number of carbon atoms. So, (4) is wrong.

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Biomolecules Test - 5

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Biomolecules Test - 5

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SHARING IS CARING

Question 1

Vitamins are needed in large amounts in the human body.

Vitamins are secreted by ductless glands.

Vitamins are synthesised by an organism.

Vitamins A, D, E and K are fat-soluble vitamins.

Solution

Question 2

Vitamin A is also known as retinol.

In carrots, a red coloured compound (carotene) breaks into vitamin C in the body.

Vitamin A is essential for growth and vision.

Vitamins of B and vitamin C are water-soluble.

Solution

Question 3

vitamin A

vitamin K

vitamin B1

vitamin B12

Solution

Question 4

beriberi

rickets

anaemia

scurvy

Solution

Question 5

12

9

8

7

Solution

Question 6

C-N bond length of peptide linkage is longer than usual bond length of C-N bond.

C-N bond length in protein is smaller than the usual bond length of the C-N bond.

Spectroscopic analysis shows planar nature of -CO-NH- group.

Peptides are formed by interaction of amino groups and carboxyl groups of amino acids.

Solution

Question 7

It forms an oxime with hydroxylamine.

It can be reduced to a hexahydric alcohol.

It reacts with 5 moles of acetic anhydride to give penta acetate.

It is oxidised by bromine water giving an acid with six carbon atoms.

Solution

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vitamin B₁

vitamin B₁₂