Biomolecules

Which of the following acids is present in Vitamin C?

(Memory Based JEE Mains 22/01/2025 ,Shift -1)

Assertion - Glucose pentaacetate shows 2,4 DNP test.

Reason - Commercially, glucose is obtained by hydrolysis of starch at 393 K by heating with dilute sulphuric acid.

Memory Based Question 28/Jan/25 Morning shift

Given below are two statements :
Statement (I): On hydrolysis, oligopeptides give rise to fewer number of \(\alpha\)-amino acids while proteins give rise to a large number of \(\beta\)-amino acids.
Statement (II) : Natural proteins are denatured by acids which convert the water soluble form of fibrous proteins to their water insoluble form.
In the light of the above statements, choose the most appropriate answer from the options given below

[JEE Main 2025, 7 Apr (Shift 2)]

Given below are two statements :
Statement I:\(\text{ D-(+)-glucose }+\mathrm{D}-(+)\text{ –fructose }\overset{-{\mathrm{H}}_{2}\mathrm{O}}{\to }\text{ sucrose }\)
\(\text{ sucrose }\overset{\text{ Hydrolysis }}{\to }\text{ D-(+)-glucose }+\text{ D-(+)–fructose }\)
Statement II : Invert sugar is formed during sucrose hydrolysis.
In the light of the above statements, choose the correct answer from the options given below

[JEE Main 2025, 7 Apr (Shift 1)]

The carbohydrate "Ribose" present in DNA is:
A. A pentose sugar
B. present in pyranose form
C. in "D" configuration
D. a reducing sugar, when free
E. in \(\alpha\)-anomeric form
Choose the correct answer from the options given below:

Which of the following acids is a vitamin ?

[JEE Main 2025, 22 Jan (Shift 1)]

Which of the following is animal starch? (Memory based 29 Jan /2025 morning shift )

A tetrapeptide "x" on complete hydrolysis produced glycine (Gly), alanine (Ala), valine (Val), leucine (Leu) in equimolar proportion each. The number of tetrapeptides (sequences) possible involving each of these amino acids is

Cheilosis and digestive disorders are due to deficiency of:

Given below are two statements:
Statement I : D-glucose pentaacetate reacts with 2, 4-dinitrophenylhydrazine
Statement II : Starch, on heating with concentrated sulfuric acid at \(100^\circ C\) and 2-3 atmosphere pressure produces glucose.

In the light of the above statements, choose the correct answer from the options given below

[JEE Main 2025, 28 Jan (Shift 1)]

Identify correct conversion during acidic hydrolysis from the following :
(A) starch gives galactose.
(B) cane sugar gives equal amount of glucose and fructose.
(C) milk sugar gives glucose and galactose.
(D) amylopectin gives glucose and fructose.
(E) amylose gives only glucose.

Choose the correct answer from the options given below

Glycosidic linkage between \({C}_{1}\) of α-glucose and \({C}_{2}\) of β-fructose is found in:

[JEE Main 2022, 25 Jul (Shift 2)]

Identify correct conversion during acidic hydrolysis from the following :
(A) starch gives galactose.
(B) cane sugar gives equal amount of glucose and fructose.
(C) milk sugar gives glucose and galactose.
(D) amylopectin gives glucose and fructose.
(E) amylose gives only glucose.

Choose the correct answer from the options given below

[JEE Main 2025, 28 Jan (Shift 2)]

A linear octasaccharide (molar mass \(=1024 ~g mol ^{-1}\) ) on complete hydrolysis produces three monosaccharides: ribose, 2-deoxyribose and glucose. The amount of 2-deoxyribose formed is \(58.26 \%( w / w )\) of the total amount of the monosaccharides produced in the hydrolyzed products. The number of ribose unit(s) present in one molecule of octasaccharide is________.

Use: Molar mass \(\left(\right.\) in g \(\left.mol ^{-1}\right)\) : ribose \(=150,2\)-deoxyribose \(=134\), glucose \(=180\);
Atomic mass (in amu): \(H =1, O =16\)

[JEE Advanced 2025, Paper-2]

The alpha-helix and beta-pleated sheet structures of protein are associated with its

[JEE Main 2025, 23 Jan (Shift 2)]

The number of possible tripeptides formed involving alanine (ala), glycine (gly) and valine (val), where no amino acid has been used more than once is:

A tetrapeptide is made of naturally occurring alanine, serine, glycine, and valine. If the C-terminal amino acid is alanine and the N-terminal amino acid is chiral, the number of possible sequences of the tetrapeptide is:

The total number of hydrogen bonds of a DNA-double Helix strand whose one strand has the following sequence of bases is _____ .
\({5}^{'}\text{ - G - G-C-A-A-A-T-C-G-G-C-T-A-3' }\)

[JEE Main 2025, 4 Apr (Shift 1)]

Sugar which does not give reddish brown precipitate with Fehling's reagent, is :

[JEE Main 2024, 30 Jan (Shift 1)]

Given below are two statements:

Statement I: Sucrose is dextrorotatory. However, sucrose upon hydrolysis gives a solution having mixture of products. This solution shows laevorotation.

Statement II: Hydrolysis of sucrose gives glucose and fructose. Since the laevorotation of glucose is more than the dextrorotation of fructose, the resulting solution becomes laevorotatory.

In the light of the above statements, choose the correct answer from the options given below

[JEE Main 2026, 22 Jan (Shift 1)]

Identify correct conversion during acidic hydrolysis from the following :
(A) starch gives galactose.
(B) cane sugar gives equal amount of glucose and fructose.
(C) milk sugar gives glucose and galactose.
(D) amylopectin gives glucose and fructose.
(E) amylose gives only glucose.

Choose the correct answer from the options given below

[JEE Main 2025, 28 Jan (Shift 2)]

Fat soluble vitamins are :
A. Vitamin \({\mathrm{B}}_{1}\)
B. Vitamin C
C. Vitamin E
D. Vitamin \({\mathrm{B}}_{12}\)
E. Vitamin K
Choose the correct answer from the options given below:

Given below are two statements:

Statement I: Sucrose is dextrorotatory. However, sucrose upon hydrolysis gives a solution having mixture of products. This solution shows laevorotation.

Statement II: Hydrolysis of sucrose gives glucose and fructose. Since the laevorotation of glucose is more than the dextrorotation of fructose, the resulting solution becomes laevorotatory.

In the light of the above statements, choose the correct answer from the options given below

[JEE Main 2026, 22 Jan (Shift 1)]

Identify the correct statement among the following:

Given below are two statements:
Statement I : D-glucose pentaacetate reacts with 2, 4-dinitrophenylhydrazine
Statement II : Starch, on heating with concentrated sulfuric acid at \(100^\circ C\) and 2-3 atmosphere pressure produces glucose.

In the light of the above statements, choose the correct answer from the options given below.

[JEE Main 2025, 28 Jan (Shift 1)]

The carbohydrate "Ribose" present in DNA is:
A. A pentose sugar
B. present in pyranose form
C. in "D" configuration
D. a reducing sugar, when free
E. in \(\alpha\)-anomeric form
Choose the correct answer from the options given below:

[JEE Main 2025, 24 Jan (Shift 1)]

Both human DNA and RNA are chiral molecules. The chirality in DNA and RNA arises due to the presence of

Given below are two statements :
Statement I:\(\text{ D-(+)-glucose }+\mathrm{D}-(+)\text{ –fructose }\overset{-{\mathrm{H}}_{2}\mathrm{O}}{\to }\text{ sucrose }\)
\(\text{ sucrose }\overset{\text{ Hydrolysis }}{\to }\text{ D-(+)-glucose }+\text{ D-(+)–fructose }\)
Statement II : Invert sugar is formed during sucrose hydrolysis.
In the light of the above statements, choose the correct answer from the options given below

Which of the following is animal starch? (Memory based 29 Jan /2025 morning shift )

Identify the essential amino acids from below :
(A) Valine
(B) Proline
(C) Lysine
(D) Threonine
(E) Tyrosine

Choose the correct answer from the options given below.

Which structure of protein remains intact after coagulation of egg white on boiling?

A tetrapeptide "x" on complete hydrolysis produced glycine (Gly), alanine (Ala), valine (Val), leucine (Leu) in equimolar proportion each. The number of tetrapeptides (sequences) possible involving each of these amino acids is

Match column-I with column-II

Choose the correct answer from the options given below:

[JEE Main 2024, 31 Jan (Shift 1)]

Match List I with List II

Choose the correct answer from the options given below :-

[JEE Main 2024, 29 Jan (Shift 2)]

Alpha helices and beta pleated sheet structure is found in which structure of proteins?

(Memory Based JEE Mains 23/01/2025 ,Shift -2)

The number of possible tripeptides formed involving alanine (ala), glycine (gly) and valine (val), where no amino acid has been used more than once is:

Which of the following biomolecules does not contain C1-C4 linkage? (memory based jee mains shift-2 28/01/2025)

The alpha-helix and beta-pleated sheet structures of protein are associated with its

[JEE Main 2025, 23 Jan (Shift 2)]

Alpha helices and beta pleated sheet structure is found in which structure of proteins?

(Memory Based JEE Mains 23/01/2025 ,Shift -2)

Statement 1: Fructose can give Tollens test even though it does not have an aldehyde group.

Statement 2: When reacted with base fructose can undergo rearrangement to produce an aldehyde group.

(JEE mains memory based shift-1 23/01/2025)

Identify the essential amino acids from below :
(A) Valine
(B) Proline
(C) Lysine
(D) Threonine
(E) Tyrosine

Choose the correct answer from the options given below

[JEE Main 2025, 29 Jan (Shift 2)]

Cheilosis and digestive disorders are due to deficiency of:

Which of the following acids is present in Vitamin C?

(Memory Based JEE Mains 22/01/2025 ,Shift -1)

Identify the correct statement among the following:

[JEE Main 2025, 2 Apr (Shift 1)]

Statement 1: Fructose can give Tollens test even though it does not have an aldehyde group.

Statement 2: When reacted with base fructose can undergo rearrangement to produce an aldehyde group.

(JEE mains memory based shift-1 23/01/2025)

Fat soluble vitamins are :
A. Vitamin \({\mathrm{B}}_{1}\)
B. Vitamin C
C. Vitamin E
D. Vitamin \({\mathrm{B}}_{12}\)
E. Vitamin K
Choose the correct answer from the options given below:

[JEE Main 2025, 3 Apr (Shift 2)]

Which of the following acids is a vitamin ?

[JEE Main 2025, 22 Jan (Shift 1)]

The incorrect statements regarding enzymes are :
(A) Enzymes are biocatalysts.
(B) Enzymes are non-specific and can catalyse different kinds of reactions.
(C) Most Enzymes are globular proteins.
(D) Enzyme - oxidase catalyses the hydrolysis of maltose into glucose.

Choose the correct answer from the option given below :

[JEE Main 2024, 06 Apr (Shift 2)]

The incorrect statements regarding enzymes are :
(A) Enzymes are biocatalysts.
(B) Enzymes are non-specific and can catalyse different kinds of reactions.
(C) Most Enzymes are globular proteins.
(D) Enzyme - oxidase catalyses the hydrolysis of maltose into glucose.

Choose the correct answer from the option given below :

[JEE Main 2024, 06 Apr (Shift 2)]

Both human DNA and RNA are chiral molecules. The chirality in DNA and RNA arises due to the presence of

A tetrapeptide is made of naturally occurring alanine, serine, glycine, and valine. If the C-terminal amino acid is alanine and the N-terminal amino acid is chiral, the number of possible sequences of the tetrapeptide is:

Assertion - Glucose pentaacetate shows 2,4 DNP test.

Reason - Commercially, glucose is obtained by hydrolysis of starch at 393 K by heating with dilute sulphuric acid.

Memory Based Question 28/Jan/25 Morning shift

Which of the glycosidic linkage between galactose and glucose is present in lactose?

[JEE MAINS 2021,5 March, Shift-1]

Match List-I with List-II

Choose the correct answer from the options given below

Sucrose on hydrolysis gives:

[NEET 2020]

Seliwanoff test and Xanthoproteic test are used for the identification of _____ and ______ respectively

The number of chiral carbon(s) present in peptide, I\( \ell \)e-Arg-Pro, is ______.

[JEE Main 2020, 5 Sep (Shift 1)]

Which one of the following statements is not true?

[JEE Main 2020, 6 Sep (Shift 2)]

Match List - I with List - II.

List - I List - II
(Saccharides) (Glycosidic-linkages found)
(A) Sucrose (I) \(\alpha 1-4\)
(B) Maltose (II) \(\alpha 1-4\) and \(\alpha 1-6\)
(C) Lactose (III) \(\alpha 1-\beta 2\)
(D) Amylopectin (IV) \(\beta 1-4\)

Choose the correct answer from the options given below

[JEE Main 2025, 28 Jan (Shift 2)]

An indicator ' X ' is used for studying the effect of variation in concentration of iodide on the rate of reaction of iodide ion with \({\mathrm{H}}_{2}{\mathrm{O}}_{2}\) at room temp. The indicator ' X ' forms blue coloured complex with compound 'A' present in the solution. The indicator ' X ' and compound ' A ' respectively are

[JEE Main 2023, 29 Jan (Shift 2)]

Which of the following acts as an antioxidant in edible oils

Which one among the following chemical tests is used to distinguish monosaccharide from disaccharide?

[JEE Main 2021, 27 Jul (Shift 1)]

Which of the following is NOT an example of fibrous protein?

[JEE Main 2021, 31 Aug (Shift 1)]

Fructose reduces Tollen's reagent due to:

The one that does not stabilize 2^o and 3^o structures of proteins is

A short peptide on complete hydrolysis produces 3 moles of glycine (G), two moles of leucine (L) and two moles of valine \(( V )\) per mole of peptide. The number of peptide linkages in it are

[JEE Main 2023, 30 Jan (Shift 2)]

Assertion (A): \(\alpha\)-halocarboxylic acid on reaction with dil. \(NH _3\) gives good yield of \(\alpha\)-amino carboxylic acid whereas the yield of amines is very low when prepared from alkyl halides.
Reason (R): Amino acids exist in zwitter ion form in aqueous medium.

[JEE Main 2023, 1 Feb (Shift 2)]

The helical structure of protein is stabilized by

Given below are two statements, one is assertion, other is reason

Assertion(A): Sucrose is dissacharide and non-reducing sugar.

Reason(R): Sucrose involves glycosidic linkage between \({C}_{1}\) of beta-glucose and \({C}_{2}\) of alpha-fructose

[JEE Main 2023, 29 Jan (Shift 2)]

Which one of the following tests is used for the identification of functional groups in organic compounds does not use copper reagent?

A peptide synthesized by the reactions of one molecule each of Glycine, Leucine, Aspartic acid and Histidine will have ____ peptide linkages

[JEE Main 2021, 1 Sep (Shift 2)]

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Ketoses give Seliwanoff's test faster than Aldoses.

Reason (R): Ketoses undergo \(\beta\)-elimination followed by formation of furfural.
In the light of the above statements, choose the correct answer from the options given below:

[JEE Main 2023, 30 Jan (Shift 1)]

Consider the following rections:
(i) Glucose \(+ ROH \xrightarrow{\text { dry } HCl }\) Acetal \(\xrightarrow[\left( CH _3 CO \right)_2 O ]{\text { x eq.of }}\) Acetyl derivative
(ii) Glucose \(\xrightarrow{ Ni / H _2} A \xrightarrow[\left( CH _3 CO \right)_2 O ]{\text { y eq.of }}\) Acetyl derivative
(iii) Glucose \(\xrightarrow[\left( CH _3 CO \right)_2 O ]{\text { z eq.of }}\) Acetyl derivative ' \(x\) ', ' \(y\) ' and ' \(z\) ' in these reactions are respectively:

Sulphur (S) containing amino acids from the following are:
(I) isoleucine

(II) cysteine

(III) lysine

(IV) methionine

(V) glutamic acid

[JEE Main 2023, 8 Apr (Shift 1)]

Number of compounds from the following which will not produce orange red precipitate with Benedict solution is .......... .

Glucose, Maltose, Sucrose, Ribose, 2-Deoxyribose, Amylose, Lactose

[JEE Main 2023, 11 Apr (Shift 2)]

Compound A gives D-Galactose and D-Glucose on hydrolysis. The compound A is:

Deficiency of vitamin K causes:

[JEE Main 2021, 18 Mar (Shift 2)]