Biomolecules — JEE Main PYQs

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)

Amino acid (A) $\quad$ Hormone (B)

Given below are two statements:

Statement I: The structure of Maltose is given below:

[Figure: Haworth structure of maltose — two glucose units joined by a glycosidic linkage]

Maltose is a non-reducing sugar.

Statement II: The structure of Lactose is given below:

[Figure: Haworth structure of lactose — galactose and glucose units joined by a glycosidic linkage]

Lactose is a reducing sugar.

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

Match the LIST-I with LIST-II

List-I (Name of amino acid)	List-II (One letter symbol/type)
A. Arginine	I. D/Non-essential
B. Aspartic acid	II. R/Essential
C. Lysine	III. E/Non-essential
D. Glutamic acid	IV. K/Essential

Choose the correct answer from the options given below:

A D-aldotetrose on oxidation with concentrated $\mathrm{HNO_3}$ resulted in optically inactive dicarboxylic acid. The structure of the D-aldotetrose is:

Identify the correct statements.

A. Glucose exists in two anomeric forms. B. Anomers of glucose differ in configuration at C–1 in cyclic hemiacetal structure. C. Melting point of $\alpha$-anomer of glucose is greater than $\beta$-anomer. D. Specific rotation of $\alpha$-anomer is $+19^\circ$ while for $\beta$-anomer is $+112^\circ$ E. $\alpha$ and $\beta$-anomers of glucose are prepared by crystallization of saturated glucose solution at 303 K and 371 K respectively.

Choose the correct answer from the options given below:

Identify the incorrect statement about tertiary structure of proteins.

Given below are two statements :

Statement I : [Figure: two Haworth (pyranose ring) structures of glucose differing only in the orientation of the -OH group at the anomeric carbon C1 (one -OH drawn below the ring, the other above)] are two anomers of D-(+)-glucose.

Statement II : The open chain forms of D-glucose and D-fructose contain three similar chiral carbons at $\mathrm{C_3}$, $\mathrm{C_4}$ and $\mathrm{C_5}$.

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

Match the LIST-I with LIST-II

List-I (Deficiency Disease)	List-II (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:

Match the LIST-I with LIST-II

List-I (Amino acid)	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:

Consider the following reactions. Total number of electrons in the $\pi$ bonds and lone pair of electrons in the product (X) is :

$\underset{\displaystyle \mathrm{CH_2OH}}{\underset{\displaystyle |}{\underset{\displaystyle (\mathrm{CHOH})_4}{\underset{\displaystyle |}{\mathrm{CHO}}}}} \xrightarrow{\text{(i) } \mathrm{HI},\ \Delta \quad \text{(ii) } \mathrm{V_2O_5}/10\text{-}20\ \mathrm{atm}/773\ \mathrm{K} \quad \text{(iii) Benzoyl chloride/Anhyd. } \mathrm{AlCl_3}}$ (X) Major product

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

Which of the following amino acid will give violet coloured complex with neutral ferric chloride solution ?

Identify the correct statement among the following :

0.1 mol of the following given antiviral compound (P) will weigh __________ $\times 10^{-1}$ g (nearest integer).

[Figure: nucleoside structure (P) — a 5-iodouracil (pyrimidine-2,4-dione with I at C5, NH at N3) attached via N1 to a furanose sugar ring bearing HOCH$_2$ at C4', OH at C3', F at C2']

(Given : molar mass in $\mathrm{g\ mol^{-1}}$ H : 1, C : 12, N : 14, O : 16, F : 19, I : 127)

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 :

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 $\mathrm{B_{12}}$ E. Vitamin K

Choose the correct answer from the options given below:

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.

[Figure: 2,5-diketopiperazine (glycine anhydride) — a six-membered ring with two NH groups and two C=O groups alternating with two CH2 groups]

Based on the information given, the dipeptide X is :

Given below are two statements:

Statement I: D-(+)-glucose + D-(+) fructose $\xrightarrow{-\mathrm{H_2O}}$ Sucrose

sucrose $\xrightarrow{\text{hydrolysis}}$ D-(+) glucose + 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

Given below are two statements :

Statement (I) : On hydrolysis, oligo peptides 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 :

$$\mathrm{H_2N{-}\underset{\underset{\mathrm{CH(CH_3)_2}}{|}}{CH}{-}COOH}$$

The above amino acid is taken to $\mathrm{pH = 2}$ (giving A) and to $\mathrm{pH = 10}$ (giving B).

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

Which of the following acids is a vitamin ?

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

[Figure: four Fischer projections — (A) CHO at top with $-$OH on the right at all three carbons below; (B) CHO at top, then $-$OH (right), HO$-$ (left), $-$OH (right), $-$OH (right); (C) CHO at top, then $-$OH (right), HO$-$ (left), HO$-$ (left), $-$OH (right); (D) drawn inverted with CHO at the bottom and, from top, HO$-$ (left), HO$-$ (left), $-$OH (right), HO$-$ (left)]

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 statements, choose the correct answer from the options given below

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

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 $\alpha$–anomeric form

Choose the correct answer from the options given below:

Match List - I with List - II.

List - I (nitrogenous base) : (A) Adenine (B) Cytosine (C) Thymine (D) Uracil

List - II (structures) : (I) [Figure: pyrimidine ring with two C=O groups and an N-H — structure of uracil] (II) [Figure: pyrimidine ring with a $\mathrm{CH_3}$ (H_3C) substituent, two C=O groups and an N-H — structure of thymine] (III) [Figure: purine ring bearing an $\mathrm{NH_2}$ group — structure of adenine] (IV) [Figure: pyrimidine ring bearing an $\mathrm{NH_2}$ group and one C=O — structure of cytosine]

Choose 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°C and 2 - 3 atmosphere pressure produces glucose.

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

Match List-I with List-II :

List-I (Saccharide)	List-II (Glycosidic linkage present)
(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 :

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 :

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

Match List I with List II

	LIST I		LIST II
A.	α - Glucose and α - Galactose	I.	Functional isomers
B.	α - Glucose and β - Glucose	II.	Homologous
C.	α - Glucose and α - Fructose	III.	Anomers
D.	α - Glucose and α - Ribose	IV.	Epimers

Choose the correct answer from the options given below:

Which of the following gives a positive test with ninhydrin ?

Coagulation of egg, on heating is because of :

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 of maltose into glucose.

Choose the correct answer from the option given below :

[Figure: Fischer projection of an open-chain sugar — CHO at the top; C2: OH on the right; C3: OH on the left; C4: OH on the right; C5: OH on the right; CH2OH at the bottom (D-glucose)]

The incorrect statement regarding the given structure is

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

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

The incorrect statement about Glucose is :

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

The number of tripeptides formed by three different amino acids using each amino acid once is ________.

Two nucleotides are joined together by a linkage known as :

Type of amino acids obtained by hydrolysis of proteins is :

Sugar which does not give reddish brown precipitate with Fehling's reagent, 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 proteins is present in DNA

E. Identical DNA strands are transferred to daughter cells.

Match List I with List II

	LIST I		LIST II
A.	Glucose/$\mathrm{NaHCO_3}$/$\Delta$	I.	Gluconic acid
B.	Glucose/$\mathrm{HNO_3}$	II.	No reaction
C.	Glucose/HI/$\Delta$	III.	n-hexane
D.	Glucose/Bromine water	IV.	Saccharic acid

Choose the correct answer from the options given below:

From the vitamins A, $\mathrm{B_1}$, $\mathrm{B_6}$, $\mathrm{B_{12}}$, C, D, E and K, the number of vitamins that can be stored in our body is________.