Biomolecules Test

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Biomolecules Test - 17

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following B group vitamins can be stored in our body?

A
Vitamin \(B_1\)

B
Vitamin \(B_2\)

C
Vitamin \(B_6\)

D
Vitamin \(B_{12}\)

Solution

Water soluble vitamins must be supplied regularly in diet because they are readily excreted in urine and cannot be stored (except vitamin \(B_{12}\)) in our body.
Question 2
1 / -0

Which of the following bases is not present in DNA?

A
Adenine

B
Thymine

C
Cytosine

D
Uracil

Solution

Uracil is present in RNA but not in DNA.
Question 3
1 / -0

Which of the following reactions of glucose can be explained only by its cyclic structure?

A
Glucose forms pentaacetate.

B
Glucose reacts with hydroxylamine to form an oxime.

C
Pentaacetate of glucose does not react with hydroxylamine.

D
Glucose is oxidised by nitric acid to gluconic acid.

Solution

The pentaacetate of glucose does not react with hydroxylamine indicating the absence of free —CHO group.
Question 4
1 / -0

Lysine, \(H_2N -(CH_2)_4 -\underset{\underset{NH_2}{|}}{CH}-COOH\) is _______________.

(i) α-Amino acid

(ii) Basic amino acid

(iii) Amino acid synthesised in body

(iv) β-Amino acid

A
(i), (ii)

B
(ii), (iii)

C
(iii), (iv)

D
(i), (iv)
Question 5
1 / -0

Which of the following monosaccharides are present as five membered cyclic structure (furanose structure)?

(i) Ribose

(ii) Glucose

(iii) Fructose

(iv) Galactose

A
(ii), (iv)

B
(i), (iii)

C
(ii), (iii)

D
(iii), (iv)

Solution

Fructose: It also exists in two cyclic forms which are obtained by the addition of —OH at \(C_5\) to the group. The ring, thus formed is a five-membered ring and is named as furanose with analogy to the compound furan. Furan is a five-membered cyclic compound with one oxygen and four carbon atoms.
Question 6
1 / -0

In fibrous proteins, polypeptide chains are held together by ___________.

A
van der Waals forces

B
disulphide linkage

C
electrostatic forces of attraction

D
hydrogen bonds

Solution

Polypeptide chains in fibrous proteins are held together by disulphide and hydrogen bonds.

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Biomolecules Test - 17

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Biomolecules Test - 17

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Question 1

Vitamin \(B_1\)

Vitamin \(B_2\)

Vitamin \(B_6\)

Vitamin \(B_{12}\)

Solution

Question 2

Adenine

Thymine

Cytosine

Uracil

Solution

Question 3

Glucose forms pentaacetate.

Glucose reacts with hydroxylamine to form an oxime.

Pentaacetate of glucose does not react with hydroxylamine.

Glucose is oxidised by nitric acid to gluconic acid.

Solution

Question 4

(i), (ii)

(ii), (iii)

(iii), (iv)

(i), (iv)

Question 5

(ii), (iv)

(i), (iii)

(ii), (iii)

(iii), (iv)

Solution

Question 6

van der Waals forces

disulphide linkage

electrostatic forces of attraction

hydrogen bonds

Solution

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