BioMolecules (Carbohydrates & Amino acids) Test

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BioMolecules (Carbohydrates & Amino acids) Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statement(s) is (are) true?

(i) All amino acids contain one chiral center.

(ii) Some amino acids contain one, while some contain more chiral center or even no chiral center.

(iii) All amino acids found in proteins have L configuration.

(iv) All amino acids found in proteins have 1° amino group.

A
(ii),(ii) & (iv)

B
(i) & (iv).

C
(ii) & (iii)

D
(i), (iii) & (iv)

Solution

Although D-alanine is a constituent of bacterial cell walls, it is not found in proteins.

The correct answer is: (ii) & (iii)
Question 2
1 / -0

Statement-1: Reducing sugars undergo mutarotation.

Statement-2 : During muarotation, one pure anomer is converted into an equilibrium mixture of two anomers.

A
Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanations of Statement-1.

B
Both Statement-1 and Statement-2 are true and Statement-2 is not the correct explanation of Statement-1.

C
Statement-1 is true but Statement-2 is false.

D
Statement-1 is false but Statement-2 is true.

Solution

One pure anomer of reducing sugars is converted into an equilibrium mixture of two anomers.

The correct answer is: Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanations of Statement-1.
Question 3
1 / -0

What is the nature of carboxylic group in the solid glycine?

A
acidic

B
none

C
both

D
basic

Solution

In solid state, amino acids exist as zwitterions, which contain −NH⁺₃ (acidic in nature) and ₋COO⁻ (basic in nature).

The correct answer is: basic
Question 4
1 / -0

The number of dipeptides possible from two molecules of a typical α-amino acid is

A
4

B
3

C
1

D
2

Solution

Two molecules of an α-amino acid will form only one dipeptide.

The correct answer is: 1
Question 5
1 / -0

The two forms of D-glucopyranose obtained from the solution of D-glucose are better called

A
anomers

B
epimers

C
enantiomers

D
isomers

Solution

The two isomeric forms (α−and β−) of D−glucopyranose differ in configuration only at C-1. Hence these are called anomers.

The correct answer is: anomers
Question 6
1 / -0

The possible number of diastereomers for D-glucose is

A
16

B
9

C
14

D
12

Solution

Total number of stereoisomers for D-glucose, having four chiral atoms, is 2⁴=16; of which two (D-glucose and L-glucose) are enantiomers so number of diastereomers of D-glucose will be 14.

The correct answer is: 14

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Re-Attempt Weekly Quiz Competition

BioMolecules (Carbohydrates & Amino acids) Test - 2

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BioMolecules (Carbohydrates & Amino acids) Test - 2

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SHARING IS CARING

Question 1

(ii),(ii) & (iv)

(i) & (iv).

(ii) & (iii)

(i), (iii) & (iv)

Solution

Question 2

Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanations of Statement-1.

Both Statement-1 and Statement-2 are true and Statement-2 is not the correct explanation of Statement-1.

Statement-1 is true but Statement-2 is false.

Statement-1 is false but Statement-2 is true.

Solution

Question 3

acidic

none

both

basic

Solution

Question 4

4

3

1

2

Solution

Question 5

anomers

epimers

enantiomers

isomers

Solution

Question 6

16

9

14

12

Solution

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