1
JEE Main 2025 (Online) 28th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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

A
Statement I is true but Statement II is false
B
Both Statement I and Statement II are true
C
Statement I is false but Statement II is true
D
Both Statement I and Statement II are false
2
JEE Main 2025 (Online) 24th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Match List - I with List - II.

List - I List - II
(A) Adenine (I) JEE Main 2025 (Online) 24th January Evening Shift Chemistry - Biomolecules Question 2 English 1
(B) Cytosine (II) JEE Main 2025 (Online) 24th January Evening Shift Chemistry - Biomolecules Question 2 English 2
(C) Thymine (III) JEE Main 2025 (Online) 24th January Evening Shift Chemistry - Biomolecules Question 2 English 3
(D) Uracil (IV) JEE Main 2025 (Online) 24th January Evening Shift Chemistry - Biomolecules Question 2 English 4

Choose the correct answer from the options given below :

A
(A)-(IV), (B)-(III), (C)-(II), (D)-(I)
B
(A)-(III), (B)-(IV), (C)-(II), (D)-(I)
C
(A)-(III), (B)-(I), (C)-(IV), (D)-(II)
D
(A)-(III), (B)-(IV), (C)-(I), (D)-(II)
3
JEE Main 2025 (Online) 24th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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:

A
  A, D and E Only
B
B, D and E Only
C
A, C and D Only
D
A, B and E Only
4
JEE Main 2025 (Online) 23rd January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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

A
tertiary structure
B
quaternary structure
C
primary structure
D
secondary structure
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