JEE Main PYQs — Biomolecules

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

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

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 -anomeric form Choose the correct answer from…

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…

Fat soluble vitamins are: A. Vitamin B1 B. Vitamin C C. Vitamin E D. Vitamin B12 E. Vitamin K Choose the correct answer from the options given below:

Which of the following acids is a vitamin?

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

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

The incorrect statement regarding the given structure is

The incorrect statement about Glucose is:

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

Type of amino acids obtained by hydrolysis of proteins is:

Which of the following gives a positive test with ninhydrin?

Coagulation of egg, on heating is because of:

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.…

Two nucleotides are joined together by a linkage known as:

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

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

L-isomer of tetrose X (C4H8O4) gives positive Schiff's test and has two chiral carbons. On acetylation. X yields triacetate. X also undergoes following reactions 'A' HNO3 'X' NaBH4 'B' \\ Chiral…

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

Compound A, C5H10O5, given a tetraacetate with Ac2O and oxidation of A with Br2-H2O gives an acid, C5H10O6. Reduction of A with HI gives isopentane. The possible structure of A is:

Choose the correct option for structures of A and B, respectively

A dipeptide, "x" on complete hydrolysis gives "y" and "z". "y" on treatment with aq. HNO2 produces lactic acid. On the other hand "z" on heating gives the following cyclic molecule. Based on the…

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

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…

Identify the correct statement among the following:

The - Helix and - Pleated sheet structures of protein are associated with its:

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

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

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

Which is not true for arginine?

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

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

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

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

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 -glycosidic linkages only. Compound…

Glycosidic linkage between C1 of -glucose and C2 of -fructose is found in

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

L- isomer of a compound 'A' (C4H8O4) gives a positive test with [Ag(NH3)2]+. Treatment of 'A' with acetic anhydride yields triacetate derivative. Compound 'A' produces an optically active compound…

When sugar 'X' is boiled with dilute H2SO4 in alcoholic solution, two isomers 'A' and 'B' are formed. 'A' on oxidation with HNO3 yields saccharic acid whereas 'B' is laevorotatory. The compound 'X'…

Which one of the following is a reducing sugar?

Animal starch is the other name of:

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

The structure of protein that is unaffected by heating is:

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

Stability of - Helix structure of proteins depends upon

Which of the following compound does not contain sulfur atom?

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

Sugar moiety in DNA and RNA molecules respectively are

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

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

Fructose is an example of:

Identify the incorrect statement from the following:

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

A non-reducing sugar “A” hydrolyses to give two reducing mono saccharides. Sugar A is:

Hydrolysis of sucrose gives:

Which one of the following compounds contains - C1 - C4 glycosidic linkage?

Which of the following is correct structure of -anomer of maltose?

C12H22O11 (Sucrose) + H2O Enzyme A C6H12O6 (Glucose) + C6H12O6 (Fructose) C6H12O6 (Glucose) Enzyme B 2C2H5OH + 2CO2 In the above reactions, the enzyme A and enzyme B, respectively are:

The secondary structure of protein is stabilised by:

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

The water soluble protein is:

Which of the following is correct structure of tyrosine?

Which one of the following is correct structure for cytosine?

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

Out of the following, which type of interaction is responsible for the stabilisation of -helix structure of proteins?

The correct structure of Rhumann's Purple, the compound formed in the reaction of ninhydrin with proteins is:

Seliwanoff test and Xanthoproteic test are used for the identification of ____ and ____ respectively.

Which one of the following statements is not true about enzymes?

Which of the following vitamin is helpful in delaying the blood clotting?

Which among the following pairs of Vitamins is stored in our body relatively for longer duration?

Identify the reagent(s) 'A' and condition(s) for the reaction

Deficiency of vitamin K causes:

Thiamine and pyridoxine are also known respectively as:

Out of following isomeric forms of uracil, which one is present in RNA?

The compound 'A' is a complementary base of ________ in DNA strands.

Which one of the following statements is not true?

Which of the following statements is correct?

The correct observation in the following reactions is: Sucrose Hydrolysis A + B Seliwanoff's Reagent

Two monomers in maltose are:

A, B and C are three biomolecules. The results of the tests performed on them are given below: | | Molisch's Test | Barfoed Test | Biuret Test | | :--- | :--- | :--- | :--- | | (A) | Positive |…

What are the functional groups present in the structure of maltose?

Which of the following statement is not true for glucose?

Consider the following reactions: (i) Glucose + ROH dry HCl Acetal [(CH3CO)2O]x eq. of Acetyl derivative (ii) Glucose Ni/H2 A [(CH3CO)2O]y eq. of Acetyl derivative (iii) Glucose [(CH3CO)2O]z eq. of…

Which of the following is not an essential amino acid?

Which of the following will react with CHCl3 + alc. KOH?

Amylopectin is composed of:

Fructose and glucose can be distinguished by:

Glucose and galactose are having identical configuration in all the positions except position

Maltose on treatment with dilute HCl gives:

Which of the following statements is not true about sucrose?

Number of stereo centers present in linear and cyclic structures of glucose are respectively.

The correct structure of histidine in a strongly acidic solution (pH=2) is:

The peptide that gives positive ceric ammonium nitrate and carbylamine test is:

Among the following compounds most basic amino acid is

The correct sequence of amino acids present in the tripeptide given below is

Which of the following tests cannot be used for identifying amino acids?

The correct structure of product 'P' in the following reaction is: Asn - Ser + (CH3CO)2O -> [NEt3] P

The increasing order of pKa of following amino acids in aqueous solution is Gly, Asp, Lys, Arg

Which of the given statements is INCORRECT about glycogen?

The correct statement(s) among I to III with respect to potassium ions that are abundant within the cell fluids, is/are: (I) They activate many enzymes. (II) They participate in the oxidation of…

Among the following compounds, which one is found in RNA?

The major product in the following reaction is:

Which of the following statements is not true about RNA?