Biomolecules

Statement 1: Fructose can give Tollens test even though it does not have an aldehyde group.

Statement 2: When reacted with base fructose can undergo rearrangement to produce an aldehyde group.

(JEE mains memory based shift-1 23/01/2025)

The reagents with which glucose does not react to give the corresponding tests/products are

A. Tollen's reagent

B. Schiff's reagent

C. \(\mathrm{HCN}\)

D. \({\mathrm{NH}}_{2}\mathrm{OH}\)

E. \({\mathrm{NaHSO}}_{3}\)

Choose the correct options from the given below:

[NEET 2024]

Identify the correct statement among the following:

Which of the following is animal starch? (Memory based 29 Jan /2025 morning shift )

Two nucleotides are joined together by a linkage known as :

[JEE Main 2024, 27 Jan (Shift 1)]

Cheilosis and digestive disorders are due to deficiency of:

Which of the following biomolecules does not contain C1-C4 linkage? (memory based jee mains shift-2 28/01/2025)

Which of the following biomolecules does not contain C1-C4 linkage? (memory based jee mains shift-2 28/01/2025)

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 \(100^\circ C\) and 2-3 atmosphere pressure produces glucose.

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

[JEE Main 2025, 28 Jan (Shift 1)]

A tetrapeptide is made of naturally occurring alanine, serine, glycine, and valine. If the C-terminal amino acid is alanine and the N-terminal amino acid is chiral, the number of possible sequences of the tetrapeptide is:

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

[JEE Main 2025, 28 Jan (Shift 2)]

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

Alpha helices and beta pleated sheet structure is found in which structure of proteins?

(Memory Based JEE Mains 23/01/2025 ,Shift -2)

Which of the following acids is a vitamin ?

[JEE Main 2025, 22 Jan (Shift 1)]

Which of the following acids is present in Vitamin C?

(Memory Based JEE Mains 22/01/2025 ,Shift -1)

The alpha-helix and beta-pleated sheet structures of protein are associated with its

[JEE Main 2025, 23 Jan (Shift 2)]

Which of the following biomolecules does not contain C1-C4 linkage? (memory based jee mains shift-2 28/01/2025)

Assertion - Glucose pentaacetate shows 2,4 DNP test.

Reason - Commercially, glucose is obtained by hydrolysis of starch at 393 K by heating with dilute sulphuric acid.

Memory Based Question 28/Jan/25 Morning shift

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 \(\alpha\)-anomeric form
Choose the correct answer from the options given below:

[JEE Main 2025, 24 Jan (Shift 1)]

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

[JEE Main 2025, 29 Jan (Shift 2)]

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