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Biomolecules

JEE Main 2026 (Online) 28th January Evening ShiftMCQEasy📈 Topic in 10% papers+4−1
Ques. 1JEE Main 2026, 28 January (Evening Shift)

Structures of four disaccharides are given below. Among the given disaccharides, the non-reducing sugar is :

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]

Answer

(1) [figure]

Solution

A sugar is reducing when it has a free hemiacetal/hemiketal –OH (free anomeric carbon).

(1) Sucrose: C1 of α-D-glucose is linked to C2 of β-D-fructose, so both anomeric carbons are used in the glycosidic bond no free anomeric –OH non-reducing.

(2) Maltose (α-1,4 link), (3) cellobiose (β-1,4 link) and (4) lactose (β-D-galactose C1 to C4 of glucose): the C1 –OH of the second glucose unit is free reducing sugars.

Answer: (1)

Keep practising — Biomolecules

Ques. 2JEE Main 2026, 24 January (Evening Shift)

The number of possible tripeptides formed involving alanine (ala), glycine (gly) and valine (val), where no amino acid has been used more than once is:

  1. 8
  2. 3
  3. 4
  4. 6
Ques. 3JEE Main 2026, 23 January (Morning Shift)

From the given following (A to D) cyclic structures, those which will not react with Tollens' reagent are: [figure]

  1. A and D
  2. A and B
  3. B and D
  4. B and C
Ques. 4JEE Main 2026, 23 January (Evening Shift)

Both human DNA and RNA are chiral molecules. The chirality in DNA and RNA arises due to the presence of

  1. L-sugar component
  2. D-sugar component
  3. Chiral phosphate unit
  4. Base unit
Ques. 5JEE Main 2026, 22 January (Morning Shift)

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

  1. Both Statement I and Statement II are false
  2. Both Statement I and Statement II are true
  3. Statement I is true but Statement II is false
  4. Statement I is false but Statement II is true
Ques. 6JEE Main 2026, 22 January (Evening Shift)

Match List-I with List-II. Choose the correct answer from the options given below :

  1. A-IV, B-III, C-II, D-I
  2. A-I, B-III, C-IV, D-II
  3. A-III, B-I, C-IV, D-II
  4. A-IV, B-I, C-II, D-III
Ques. 7JEE Main 2026, 21 January (Morning Shift)

Identify the correct statements. Choose the correct answer from the options given below :

  1. C and D Only
  2. A and D Only
  3. C and E Only
  4. B and E Only
Ques. 8JEE Main 2026, 21 January (Evening Shift)

The correct statements are : Choose the correct answer from the options given below :

  1. A, B and D Only
  2. A, C and D Only
  3. B and C Only
  4. A and B Only
Ques. 9JEE Main 2025, 8 April (Evening Shift)

[figure] Choose the correct option for structures of A and B, respectively

  1. [figure] and [figure]
  2. [figure] and [figure]
  3. [figure] and [figure]
  4. [figure] and [figure]
Ques. 10JEE Main 2025, 7 April (Morning Shift)

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

  1. Both Statement I and Statement II are false
  2. Statement I is false but Statement II is true
  3. Both Statement I and Statement II are true
  4. Statement I is true but Statement II is false
Ques. 11JEE Main 2025, 7 April (Evening Shift)

Given below are two statements : In the light of the above statements, choose the most appropriate answer from the options given below :

  1. Statement I is incorrect but Statement II is correct
  2. Both Statement I and Statement II are incorrect
  3. Both Statement I and Statement II are correct
  4. Statement I is correct but Statement II is incorrect

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