JEE Main
Chemistry
Biomolecules
Previous Years Questions

All structures given below are of vitamin C. Most stable of them is :
The correct representation in six membered pyranose form for the following sugar [X] is ...
A protein '$$\mathrm{X}$$' with molecular weight of $$70,000 \mathrm{~u}$$, on hydrolysis gives amino acids. One of these amino acid is One of these a...
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 :
Match items of Row I with those of Row II. Row I : Row II : (i) $$\alpha$$-$$\mathrm{D}$$-$$(-)$$-$$\mathrm{Fructofuranose}$$ (ii) $$\beta$$-D-$$(-)... Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Amylose is insoluble in water. Reas... Two statements in respect of drug-enzyme interaction are given below Statement I : Action of an enzyme can be blocked only when an inhibitor blocks th... The formulas of A and B for the following reaction sequence are... Match List - I with List - II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-f... For the below given cyclic hemiacetal (X), the correct pyranose structure is : ... Match List - I with Match List - II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;... A sugar 'X' dehydrates very slowly under acidic condition to give furfural which on further reaction with resorcinol gives the coloured product after ... Animal starch is the other name of Which one of the following is a reducing sugar? Glycosidic linkage between C1 of$$\alpha$$-glucose and C2 of$$\beta$$-fructose is found in During the denaturation of proteins, which of these structures will remain intact? The sugar produced after complete hydrolysis of DNA is The structure of protein that is unaffected by heating is Sugar moiety in DNA and RNA molecules respectively are When sugar 'X' is boiled with dilute H2SO4 in alcoholic solution, two isomers 'A' and 'B' are formed. 'A' on oxidation with HNO3 yields saccharic acid... Given below are two statements. Statement I : Maltose has two$$\alpha$$-D-glucose units linked at C1 and C4 and is a reducing sugar. Statement II : M... Match List-I with List-II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family... A chemical which stimulates the secretion of pepsin is : Which of the following is not an example of fibrous protein? Which one of the following compounds contains$$\beta$$-C1-C4 glycosidic linkage? Hydrolysis of sucrose gives : Out of following isomeric forms of uracil, which one is present in RNA? Given below are two statements : one is labelled as Assertion (A) and other is labelled as Reason (R). Assertion (A) : Sucrose is a disaccharide and a... Compound A gives D-Galactose and D-Glucose on hydrolysis. The compound A is : Which one among the following chemical tests is used to distinguish monosaccharide from disaccharide? Which one of the following is correct structure for cytosine? The water soluble protein is : Which one of the following statements is not true about enzymes? Deficiency of vitamin K causes : A non-reducing sugar "A" hydrolyses to give two reducing mono saccharides. Sugar A is Fructose is an example of : The secondary structure of protein is stabilised by: Match List - I with List - II. List - I List - II (a) Sucrose (i)$$\beta $$-D-Galactose and$$\beta $$... Seliwanoff test and Xanthoproteic test are used for the identification of ___________ and ________ respectively. Which of the following is correct structure of$$\alpha$$-anomer of maltose? Which of the glycosidic linkage between galactose and glucose is present in lactose? Out of the following, which type of interaction is reponsible for the stabilisation of$$\alpha $$-helix structure of proteins ? Which one of the following statements is not true? Which of the following is not an essential amino acid : What are the functional groups present in the structure of maltose? Consider the following rections: 'x', 'y' and 'z' in these reactions are respectively.... A, B and C are three biomolecules. The results of the tests performed on them are given below: A, B and C are respectively :... Two monomers in maltose are : Which of the following statement is not true for glucose? Which of the following statements is correct ? Which of the given statements is INCORRECT about glycogen? Glucose and Galactose are having identical configuration in all the positions except position. Which of the following statements is not true about RNA? Number of stereo centers present in linear and cyclic structures of glucose are respectively : Amylopectin is compound of : The peptide that gives positive ceric ammonium nitrate and carbylamine tests is : Which of the following statements is not true about sucrose? Fructose and glucose can be distinguished by : Maltose on treatment with dilute HCI gives : The correct structure of histidine in a strongly acidic solution (pH = 2) is - Among the following compounds most basic amino acid is - Among the following compounds, which one is found in RNA ? Which of the following tests cannot be used for identifying amino acids? The correct structure of product 'P' in the following reactions is : ... The correct sequence of amino acids present in the tripeptide given below is : ... The increasing order of pka of the following amino acids in aqueous solution is : Gly Asp Lys Arg Among the following, the incorrect statement is : Glucose on prolonged heating with HI gives The predominant form of histamine present in human blood is (pKa, Histidine = 6.0) The dipeptide, Gln-Gly, on treatment with CH3COCl followed y aqueous work up gives : Which of the following is the corect structure of Adenosine? Which of the following will not exist in zwitter ionic form at pH=7 ? The incorrect statement among the following is : Among the following, the essential amino acid is : Which of the following compounds will behave as a reducing sugar in an aqueous KOH solution? Observation of “Rhumann’s purple” is a confirmatory test for the presence of : Consider the following sequence for aspartic acid : The pI (isoelectric point) of aspartic acid is :... Thiol group is present in : Which of the vitamins given below is water soluble? Which one of the following bases is not present in DNA? Synthesis of each molecule of glucose in photosynthesis involves: Which of the following compounds can be detected by Molisch’s test ? Which one of the following statements is correct ? The presence or absence of hydroxyl group on which carbon atom of sugar differentiates RNA and DNA ? The two functional groups present in a typical carbohydrate are$$\alpha$$-D-(+)-glucose and$$\beta$$-D-(+)-glucose are The secondary structure of a protein refers to The term anomers of glucose refers to The pyrimidine bases present in DNA are In both DNA and RNA, heterocyclic base and phosphate ester linkages are at- Identify the correct statements regarding enzymes Which base is present in RNA but not in DNA? Insulin production and its action in human body are responsible for the level of diabetes. This compound belongs to which of the following categories?... Complete hydrolysis of cellulose gives The reason for double helical structure of$$DNA$$is operation of The functional group, which is found in amino acid is RNA is different from DNA because RNA contains ## Numerical Testosterone, which is a steroidal hormone, has the following structure. The total number of asymmetric carbon atom/s in testosterone is ____________... A short peptide on complete hydrolysis produces 3 moles of glycine (G), two moles of leucine (L) and two moles of valine (V) per mole of peptide. The ... Total number of tripeptides possible by mixing of valine and proline is ___________ Uracil is a base present in RNA with the following structure. % of N in uracil is ___________ Given: Molar mass N = 14 g mol$$^{-1}$$O = 16 g mol$$^...
In a linear tetrapeptide (Constituted with different amino acids), (number of amino acids) $$-$$ (number of peptide bonds) is ________.
The number of oxygens present in a nucleotide formed from a base, that is present only in RNA is ___________.
In alanylglycylleucylalanylvaline, the number of peptide linkages is ___________.
The total number of negative charge in the tetrapeptide, Gly-Glu-Asp-Tyr, t pH 12.5 will be ______________. (Integer answer)
The number of chiral carbons present in sucrose is _____.
The number of chiral carbon(s) present in peptide, Ile-Arg-Pro, is _____.
The number of groups present in a tripeptide Asp–Glu–Lys is ____....
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