Biomolecules PYQs - Last 10 Years

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Practice 177 JEE Main Chemistry questions from Biomolecules. Use the year-wise and type-wise breakdown to prioritize recent PYQs, then continue into the question list below.

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Chemistry / Organic Chemistry

2017-2026

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177

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2017-2026

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177PYQs

MCQ86.4%

INTEGER13.6%

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#1 Easy110

#2 Medium65

#3 Hard2

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Last 10 Years Biomolecules Questions

Showing 50 of 177 filtered questions.

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

\(\text { Match the List-I with List-II }\)

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\(\text { Match the List-I with List-II }\)

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Identify the correct statements.
A. Glucose exists in two anomeric forms.
B. Anomers of glucose differ in configuration at $\mathrm{C}-1$ in cyclic hemiacetal structure.
C. Melting point of $\alpha$ - anomer of glucose is greater than $\bet...

Identify the incorrect statement about tertiary structure of proteins.

\(\text { Given below are two statements : }\)
\(\text { Statement I : }\) and are two anomers of D-(+)-glucode.
Statement II : The open chain forms of D-glucose and D- fructose contain three similar chiral carbons at $\mathrm{C}_3, \...

Match the List-I with List-II
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Given below are two statements :

Statement I : The structure of Maltose is given below:

Statement II : The structure of Lactose is given below :

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

A D-aldotetrose on oxidation with concentrated $\mathrm{HNO}_3$ resulted in optically inactive dicarboxylic acid. The structure of the D-aldotetrose is :

Match List - I with List - II.

List - IVitamin

List - IIName

A
Vitamin B1
I
Pyridoxine

B
Vitamin B2
II
Ascorbic acid

C
Vitamin B6
III
Thiamine

...

Identify the correct pair having amino acid (A) and the hormone (B) that is iodinated derivative of the amino acid (A).(T and Y represent one letter code for amino acids)

In the given pentapeptide, find out an essential amino acid $(\mathrm{Y})$ and the sequence present in the pentapeptide :

\(\text { Choose the correct answer from the options given below : }\)

Structures of four disaccharides are given below. Among the given disaccharides, the non-reducing sugar is :

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:

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 : 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 an...

\(\text { Match List - I with List - II. }\)

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Identify the correct statements.
A. Arginine and Tryptophan are essential amino acids.
B. Histidine does not contain heterocyclic ring in its structure.
C. Proline is a six membered cyclic ring amino acid.
D. Glycine does not have chiral ce...

The correct statements are :
A. Activation energy for enzyme catalysed hydrolysis of sucrose is lower than that of acid catalysed hydrolysis.
B. During denaturation, secondary and tertiary structures of a protein are destroyed but primary s...

Given below are two statements:
Statement I: D-(+)-glucose + D-(+) fructose $\xrightarrow{-\mathrm{H}_2 \mathrm{O}}$ Sucrose
$$\text { sucrose } \xrightarrow{\text { hydrolysis }} \mathrm{D}-(+) \text { glucose }+\mathrm{D}-(+) \text { fruc...

Given below are two statements :Statement (I) : On hydrolysis, oligo peptides give rise to fewer number of α-amino acids while proteins give rise to a large number of β-amino acids.Statement (II) : Natural proteins are denatured by acids wh...

The total number of hydrogen bonds of a DNA-double Helix strand whose one strand has the following sequence of bases is ________.
$$5^{\prime}-\mathrm{G}-\mathrm{G}-\mathrm{C}-\mathrm{A}-\mathrm{A}-\mathrm{A}-\mathrm{T}-\mathrm{C}-\mathrm{G...

INTEGER+4 / -12025

Identify the pair of reactants that upon reaction, with elimination of HCl will give rise to the dipeptide Gly-Ala.

A dipeptide, " $x$ " on complete hydrolysis gives " $y$ " and " $z$ ". " $y$ " on treatment with aq. $\mathrm{HNO}_2$ produces lactic acid. On the other hand " z " on heating gives the following cyclic molecule.

Based on the information gi...

\(\text { Which of the following is the correct structure of L-Fructose? }\)

Fat soluble vitamins are:
A. Vitamin $\mathrm{B}_1$
B. Vitamin C
C. Vitamin E
D. Vitamin B 12
E. Vitamin K
Choose the correct answer from the options given below:

Identify the correct statement among the following :

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 List - I with List - II.

List - I (Carbohydrate)
List - II (Linkage Source)

(A) Amylose
(I) $\beta$ - $C_1 - C_4$, plant

(B) Cellulose
(II) $\alpha$ - $C_1 - C_4$, animal

(C) Glycogen
(III) $\alpha$ - $C_1 - C_4$, $\alpha$ ...

Identify the essential amino acids from below:(A) Valine(B) Proline(C) Lysine(D) Threonine(E) TyrosineChoose the correct answer from the options given below:

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 $100^{\circ} \mathrm{C}$ and $2-3 \mathrm{atmosphere}$ pressur...

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 f...

Match List-I with List-II.

List - I (Saccharides)
List - II (Glycosidic-linkages found)

(A) Sucrose
(I) α 1 $-$ 4

(B) Maltose
(II) α 1 $-$ 4 and α 1 $-$ 6

(C) Lactose
(III) α 1 $-$ β 2
...

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

Match List - I with List - II.

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Given below are two statements:
Statement I: Fructose does not contain an aldehydic group but still reduces Tollen's reagent
Statement II: In the presence of base, fructose undergoes rearrangement to give glucose.
In the light of the above ...

The $\alpha$-Helix and $\beta$ - Pleated sheet structures of protein are associated with its :

Which of the following acids is a vitamin ?

Identify the number of structure/s from the following which can be corelated to D-glyceraldehyde.

Total number of essential amino acid among the given list of amino acids is ________.
Arginine, Phenylalanine, Aspartic acid, Cysteine, Histidine, Valine, Proline

INTEGER+4 / -12024

The \(\mathrm{F}^{-}\) ions make the enamel on teeth much harder by converting hydroxyapatite (the enamel on the surface of teeth) into much harder fluoroapatite having the formula.

The incorrect statement about Glucose is :

The incorrect statement regarding the given structure is

The total number of carbon atoms present in tyrosine, an amino acid, is ________.

INTEGER+4 / -12024

DNA molecule contains 4 bases whose structure are shown below. One of the structures is not correct, identify the incorrect base structure.

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...

Which of the following gives a positive test with ninhydrin ?

Coagulation of egg, on heating is because of :

Which of the following is the correct structure of L-Glucose?

Match List I with List II

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