Biomolecules · Chemistry · JEE Main

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:

Match List - I with List - II.

Choose the correct answer from the options given below :

Match List-I with List-II.

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 :

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 $2-3 \mathrm{atmosphere}$ 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		List - II
(A)	Adenine	(I)
(B)	Cytosine	(II)
(C)	Thymine	(III)
(D)	Uracil	(IV)

Choose the correct answer from the options given below :

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:

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

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

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

Which of the following acids is a vitamin ?

The incorrect statement about Glucose is :

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 regarding the given structure is

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 :

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

Coagulation of egg, on heating is because of :

Which of the following gives a positive test with ninhydrin ?

Match List I with List II

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

Match List I with List II

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

Match List I with List II

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Type of amino acids obtained by hydrolysis of proteins is :

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

Two nucleotides are joined together by a linkage known as :

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

The products formed in the above reaction are

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, '$$\mathrm{X}$$' yields triacetate. '$$\mathrm{X}$$' also undergoes following reactions

'$$\mathrm{X}$$' is

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

Match List I with List II

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

(a) isoleucine (b) cysteine (c) lysine (d) methionine (e) glutamic acid

Match List I with List II

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Match List I with List II

Choose the correct answer from the options given below:

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 very low when prepared from alkyl halides.

Reason (R) : Amino acids exist in zwitter ion form in aqueous medium.

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

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

Match List I with List II

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

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 :

(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 :

Match items of Row I with those of Row II.

Row I :

Row II :

(i) $$\alpha$$-$$\mathrm{D}$$-$$(-)$$-$$\mathrm{Fructofuranose}$$

(ii) $$\beta$$-D-$$(-)$$-Fructofuranose

(iii) $$\alpha$$-D-$$(-)$$ Glucopyranose

(iv) $$\beta$$-D-$$(-)$$-Glucopyranose

Correct match is

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 correct answer from the options given below.

The formulas of A and B for the following reaction sequence

are

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

Match List - I with Match List - II.

Choose the correct answer from the options given below:

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

Animal starch is the other name of

Which one of the following is a reducing sugar?

Glycosidic linkage between C₁ of $$\alpha$$-glucose and C₂ of $$\beta$$-fructose is found in

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

The sugar produced after complete hydrolysis of DNA is

The structure of protein that is unaffected by heating is

Sugar moiety in DNA and RNA molecules respectively are

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 where as 'B' is laevorotatory. The compound 'X' is :

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

Given below are two statements.

Statement I : Maltose has two $$\alpha$$-D-glucose units linked at C₁ and C₄ and is a reducing sugar.

Statement II : Maltose has two monosaccharides : $$\alpha$$-D-glucose and $$\beta$$-D-glucose linked at C₁ and C₆ and it is a non-reducing sugar.

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

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 (B) and an optically inactive compound (C) on treatment with bromine water and HNO₃ respectively. Compound (A) is :

Match List-I with List-II

Choose the most appropriate answer from the options given below :

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

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 $$\beta$$-glycosidic linkages only. Compound 'X' is :

Total number of essential amino acid among the given list of amino acids is ________.

Arginine, Phenylalanine, Aspartic acid, Cysteine, Histidine, Valine, Proline

The total number of carbon atoms present in tyrosine, an amino acid, 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 of 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 proteins is present in DNA

E. Identical DNA strands are transferred to daughter cells.

Number of compounds among the following which contain sulphur as heteroatom is ___________.

Furan, Thiophene, Pyridine, Pyrrole, Cysteine, Tyrosine

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

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

Testosterone, which is a steroidal hormone, has the following structure.

The total number of asymmetric carbon atom/s in testosterone is ____________.

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

Uracil is a base present in RNA with the following structure. % of N in uracil is ___________

Given:

Molar mass N = 14 g mol$$^{-1}$$

O = 16 g mol$$^{-1}$$

C = 12 g mol$$^{-1}$$

H = 1 g mol$$^{-1}$$

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

C₆H₁₂O₆ $$\buildrel \text{Zymase} \over \longrightarrow $$ A $$\mathrel{\mathop{\kern0pt\longrightarrow} \limits_\Delta ^\text{NaOI}} $$ B + CHI₃

The number of carbon atoms present in the product B is _______________.

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

How many of the given compounds will give a positive Biuret test ____________ ?

Glycine, Glycylalanine, Tripeptide, Biuret

In alanylglycyl leucyl alanyl valine, the number of peptide linkages is ___________.