JEE Mains JEE Advance BITSAT
JEE Mains | PYQ

Year

All years 2026 2025 2024 2023 2022 2021

Identify the incorrect statement from the following:

The conversion of hydroxyapatite occurs due to presence of \( \mathrm{F^-} \) ions in water. The correct formula of hydroxyapatite is:

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Sucrose is a disaccharide and a non-reducing sugar.
Reason (R) : Sucrose involves glycosidic linkage between \( C_{1} \) of \( \beta \)-glucose and \( C_{2} \) of \( \alpha \)- fructose.
Choose the most appropriate answer from the options given below:

A peptide synthesized by the reaction of one molecule each of Glycine, Leucine, Aspartic acid and Histidine will have____ peptide linkages.

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

The secondary structure of protein is stabilized by:

Match List-I with List-II:

Choose the most appropriate answer from the options given below:

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

The water soluble protein is:

Which one of the following methods is most suitable for preparing deionized water?

The total number of negative charge in the tetrapeptide, Gly–Glu–Asp–Tyr, at \( \mathrm{pH} \) \( 12.5 \) will be ________. (Integer answer)

Reaction of Grignard reagent, \( \mathrm{C_2H_5MgBr} \) with \( \mathrm{C_8H_8O} \) followed by hydrolysis gives compound "A" which reacts instantly with Lucas reagent to give compound B, \( \mathrm{C_{10}H_{13}Cl} \). The compound B is:

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

Which of the following polymer is used in the manufacture of wood laminates?

Thiamine and pyridoxine are also known respectively as:

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

Which one of the following compounds contains \( \beta - \mathrm{C}_1 - \mathrm{C}_4 \) glycosidic linkage?

Hydrolysis of sucrose gives :

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

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

Which of the following is correct structure of tyrosine?

Which one of the following is correct structure for cytosine?

\( \displaystyle \underset{\text{Sucrose}}{\text{C}_{12}\text{H}_{22}\text{O}_{11}} + \text{H}_2\text{O} \xrightarrow{\text{Enzyme A}} \underset{\text{Glucose}}{\text{C}_6\text{H}_{12}\text{O}_6} + \underset{\text{Fructose}}{\text{C}_6\text{H}_{12}\text{O}_6}\)
\( \displaystyle \underset{\text{Glucose}}{\text{C}_6\text{H}_{12}\text{O}_6} \xrightarrow{\text{Enzyme B}} 2\text{C}_2\text{H}_5\text{OH} + 2\text{CO}_2 \)
In the above reactions, the enzyme A and enzyme B respectively are :

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

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

Deficiency of vitamin \( K \) causes:

← PreviousQuestion 8 of 26Next →

JEE Main 2021 27th August Morning Shift

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