Biomolecules — JEE Main PYQs

If one strand of a DNA has the sequence ATGCTTCA, sequence of the bases in complementary strand is:

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

Type of amino acids obtained by hydrolysis of proteins is :

From the vitamins $\mathrm{A}$, ${\mathrm{B}}_1$, ${\mathrm{B}}_6$, ${\mathrm{B}}_{12}$, $\mathrm{C}$, $\mathrm{D}$, $\mathrm{E}$ and $\mathrm{K}$, the number vitamins that can be stored in our body is ____.

The total number of correct statements, regarding the nucleic acids is ____.
A. RNA is regarded as the reserve of genetic information.
B. DNA molecule self-duplicates during cell division
C. DNA synthesizes proteins in the cell.
D. The message for the synthesis of particular prot …

Sulphur (S) containing amino acids from the following are:
(a) isoleucine
(b) cysteine
(c) lysine
(d) methionine
(e) glutamic acid

The one that does not stabilize $2^{\circ }$ and $3^{\circ }$ structures of proteins is

L-isomer of tetrose $\mathrm{X}\left({\mathrm{C}}_4{\mathrm{H}}_8{\mathrm{O}}_4\right)$ gives positive Schiff's test and has two chiral carbons. On acetylation. ' X ' yields triacetate. ' X ' also undergoes following reactions …

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.

In an oligopeptide named Alanylglycylphenyl alanyl isoleucine, the number of ${\mathrm{sp}}^2$ hybridised carbons is $\_\_\_\_$ .

D- (+)- Glyceraldehyde $\underset{\text{ (ii) }{\mathrm{H}}_2\mathrm{O}/{\mathrm{H}}^{+}}{\overset{\text{(i) }\mathrm{HCN}}{\to }}$
(iii) ${\mathrm{HNO}}_3$

The products formed in the above reaction are

The naturally occurring amino acid that contains only one basic functional group in its chemical structure is

Which is not true for arginine?

The correct representation in six membered pyranose form for the following sugar [ X ] is

Total number of tripeptides possible by mixing of valine and proline is ______

The variation of the rate of an enzyme catalyzed reaction with substrate concentration is correctly represented by graph

Match items of Row I with those of Row II.

Row I:
(P) (see structure)
(Q) (see structure)
(R) (see structure)
(S) (see structure)

Row II:
(i) $\alpha$-D-(-) Fructofuranose.
(ii) $\beta$-D-(-) Fructofuranose
(iii) $\alpha$-D-(-) Glucopyranose.
(iv) β-D-(-) Glucopyranose

Correct …

Number of cyclic tripeptides formed with 2 amino acids $A$ and $B$ is:

Following tetrapeptide can be represented as
(F, L, D, Y, I, Q, P are one letter codes for amino acids)

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 β-elimination followed by formation of furfural.

In the light of the above …

All structures given below are of vitamin C. Most stable of them is :

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : $\alpha$-halocarboxylic acid on reaction with dil. ${\mathrm{NH}}_3$ gives good yield of $\alpha$-amino carboxylic acid whereas the yield of amines is …

Compound A, ${\mathrm{C}}_5{\mathrm{H}}_{10}{\mathrm{O}}_5$, given a tetraacetate with ${\mathrm{Ac}}_2\mathrm{O}$ and oxidation of A with ${\mathrm{Br}}_2-{\mathrm{H}}_2\mathrm{O}$ gives an acid, ${\mathrm{C}}_5{\mathrm{H}}_{10}{\mathrm{O}}_6$. Reduction of A with HI gives iso …

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 ______.

A protein ' X ' with molecular weight of $70,000\mathrm{u}$, on hydrolysis gives amino acids. One of these amino acid is

Match List I with List II:
List-I (Enzymatic reaction): A. Sucrose → Glucose and Fructose B. Glucose → ethyl alcohol and CO₂ C. Starch → Maltose D. Proteins → Amino acids
List-II (Enzyme): I. Zymase II. Pepsin III. Invertase IV. Diastase
Choose the correct answer from th …

Match List I with List II:
List-I (Vitamin): A. Vitamin A B. Thiamine C. Ascorbic acid D. Riboflavin
List-II (Deficiency disease): I. Beri-Beri II. Cheilosis III. Xerophthalmia IV. Scurvy
Choose the correct answer from the options given below:

Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Amylose is insoluble in water.
Reason R : Amylose is a long linear molecule with more than 200 glucose units.

In the light of the above statements, choose the corr …

For the below given cyclic hemiacetal (X), the correct pyranose structure is:

Statements about Enzyme Inhibitor Drugs are given below:
(A) There are Competitive and Non-competitive inhibitor drugs.
(B) These can bind at the active sites and allosteric sites.
(C) Competitive Drugs are allosteric site blocking drugs.
(D) Non-competitive Drugs are active site …

Two statements in respect of drug-enzyme interaction are given below
Statement I: Action of an enzyme can be blocked only when an inhibitor blocks the active site of the enzyme.
Statement II: An inhibitor can form a strong covalent bond with the enzyme.
In the light of the above …

The formulas of A and B for the following reaction sequence are

A sugar ' X ' dehydrates very slowly under acidic condition to give furfural which on further reaction with resorcinol gives the coloured product after sometime. Sugar ' X ' is

During the denaturation of proteins, which of these structures will remain intact?

Animal starch is the other name of :

Match List-I with List-II

List-I
(A) Glucose + HI
(B) Glucose + ${\mathrm{Br}}_2$ water
(C) Glucose + acetic anhydride
(D) Glucose + ${\mathrm{HNO}}_3$

List-II
(I) Gluconic acid
(II) Glucose pentacetate
(III) Saccharic acid
(IV) Hexane

Choose the correct answer from the option …

Glycosidic linkage between $\mathrm{C}{}_1$ of $\alpha$-glucose and $\mathrm{C}{}_2$ of $\beta$-fructose is found in

Some drugs bind to a site other than, the active site of an enzyme. This site is known as

Which of the following is reducing sugar?

When sugar 'X' is boiled with dilute ${\mathrm{H}}_2{\mathrm{SO}}_4$ in alcoholic solution, two isomers 'A' and 'B' are formed. 'A' on oxidation with ${\mathrm{HNO}}_3$ yields saccharic acid where as 'B' is laevorotatory. The compound 'X' is :

Given below are two statements.

Statments I: Maltose has two $\alpha$-D-glucose units linked at ${\mathrm{C}}_1$ and ${\mathrm{C}}_4$ and is a reducing sugar.

Statement II: Maltose has two monosaccharides: $\alpha$-D-glucose and $\beta$-D-glucose linked at ${\mathrm{C}}_1$ and …

Stability of $\alpha$-Helix structure of proteins depends upon

The structure of protein that is unaffected by heating is :

Which one of the following is a water soluble vitamin, that is not excreted easily?

Sugar moiety in DNA and RNA molecules respectively are

The number of oxygens present in a nucleotide formed from a base, that is present only in RNA is ______.

L-isomer of a compound 'A' $({\mathrm{C}}_4{\mathrm{H}}_8{\mathrm{O}}_4)$ gives a positive test with $[\mathrm{Ag}({\mathrm{NH}}_3{)}_2{]}^{+}$. Treatment of 'A' with acetic anhydride yield triacetate derivative. Compound 'A' produces an optically active compound (B) and an optic …

In a linear tetrapeptide (Constituted with different amino acids), (number of amino acids) - (number of peptide bonds) is ____.

A polysaccharide 'X' on boiling with dil H₂SO₄ at 393 K under 2-3 atm pressure yields 'Y'. 'Y' on treatment with bromine water gives gluconic acid. 'X' contains β-glycosidic linkages only. Compound 'X' is:

In alanylglycylleucylalanylvaline, the number of peptide linkages is ____.