JEE Main 2026 (Online) 8th April Evening Shift | Biomolecules Question 1 | Chemistry

1

JEE Main 2026 (Online) 8th April Evening Shift

MCQ (Single Correct Answer)

+4

-1

The incorrect statement from the following with respect to carbohydrates is :

A

All monosaccharides are reducing sugars.

B

The monosaccharide units obtained from hydrolysis of oligosaccharides are always the same.

C

Starch and cellulose are typical examples of polysaccharides, which are very high molecular weight compounds of more than ten monosaccharide units.

D

Open chain and cyclic structures co-exist at equilibrium that are responsible for certain properties as in the case of $\mathrm{D}-(+)$-glucose.

2

JEE Main 2026 (Online) 6th April Morning Shift

MCQ (Single Correct Answer)

+4

-1

$$ \text { Match the List-I with List-II } $$

List-I Deficiency Disease		List-I Vitamin
A.	Scurvy	I.	Pyridoxine
B.	Convulsions	II.	Vitamin A
C.	Cheilosis	III.	Ascorbic Acid
D.	Xerophthalmia	IV.	Riboflavin

Choose the correct answer from the options given below :

A

A-I, B-III, C-II, D-IV

B

A-I, B-III, C-IV, D-II

C

A-III, B-I, C-IV, D-II

D

A-III, B-I, C-II, D-IV

3

JEE Main 2026 (Online) 6th April Morning Shift

MCQ (Single Correct Answer)

+4

-1

$$ \text { Match the List-I with List-II } $$

$$ \begin{gathered} \text { List-I } \\ \text { Amino acid } \end{gathered} $$		List-II Positive reaction/Test for functional group present in side chain of amino acid
A.	Glutamine	I.	Hinsberg's test
B.	Lysine	II.	Neutral $\mathrm{FeCl}_3$ test
C.	Tyrosine	III.	Ceric ammonium nitrate test
D.	Serine	IV.	Hoffman bromamide degradation

Choose the correct answer from the options given below :

A

A-IV, B-II, C-I, D-III

B

A-IV, B-I, C-II, D-III

C

A-III, B-II, C-I, D-IV

D

A-IV, B-I, C-III, D-II

4

JEE Main 2026 (Online) 5th April Evening Shift

MCQ (Single Correct Answer)

+4

-1

Identify the incorrect statement about tertiary structure of proteins.

A

They can be fibrous or globular in structure.

B

The main forces that stabilize the structure are hydrogen bonding, disulphide links, van der Waals and electrostatic forces of attraction.

C

The structure remains intact when exposed to pH changes.

D

A linear polypeptide chain will convert to a secondary structure and then further folding of the secondary structure will convert to tertiary structure.

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