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Biomolecules

JEE Main 2025 (Online) 2nd April Evening ShiftMCQEasy📈 Topic in 24% papers+4−1
Ques. 1JEE Main 2025, 2 April (Evening Shift)

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:

  1. 32
  2. 24
  3. 8
  4. 16

Answer

(2) 24

Solution

Equimolar hydrolysis products each of the four different amino acids occurs exactly once in the tetrapeptide.

A peptide chain has a definite direction (N-terminal to C-terminal), so every different order of the four residues is a different tetrapeptide.

Number of sequences = 4! = 4 3 2 1 = 24

Answer: (2)

Keep practising — Biomolecules

Ques. 2JEE Main 2025, 29 January (Morning Shift)

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

  1. (A)-(II), (B)-(III), (C)-(I), (D)-(IV)
  2. (A)-(III), (B)-(III), (C)-(I), (D)-(IV)
  3. (A)-(IV), (B)-(I), (C)-(III), (D)-(II)
  4. (A)-(IV), (B)-(I), (C)-(II), (D)-(III)
Ques. 3JEE Main 2025, 29 January (Evening Shift)

Identify the essential amino acids from below: Choose the correct answer from the options given below:

  1. (A), (C) and (D) only
  2. (C), (D) and (E) only
  3. (A), (C) and (E) only
  4. (B), (C) and (E) only
Ques. 4JEE Main 2025, 28 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. Statement I is true but Statement II is false
  2. Both Statement I and Statement II are true
  3. Statement I is false but Statement II is true
  4. Both Statement I and Statement II are false
Ques. 5JEE Main 2025, 28 January (Evening Shift)

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

  1. (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
  2. (A)-(I), (B)-(II), (C)-(III), (D)-(IV)
  3. (A)-(II), (B)-(IV), (C)-(III), (D)-(I)
  4. (A)-(IV), (B)-(II), (C)-(I), (D)-(III)
Ques. 6JEE Main 2025, 28 January (Evening Shift)

Identify correct conversion during acidic hydrolysis from the following : Choose the correct answer from the options given below :

  1. (A), (B) and (C) only
  2. (B), (C) and (D) only
  3. (B), (C) and (E) only
  4. (C), (D) and (E) only
Ques. 7JEE Main 2025, 24 January (Morning Shift)

The carbohydrate "Ribose" present in DNA, is Choose the correct answer from the options given below:

  1. A, D and E Only
  2. B, D and E Only
  3. A, C and D Only
  4. A, B and E Only
Ques. 8JEE Main 2025, 24 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)-(III), (B)-(IV), (C)-(II), (D)-(I)
  3. (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
  4. (A)-(III), (B)-(IV), (C)-(I), (D)-(II)
Ques. 9JEE Main 2025, 23 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. Statement I is true but Statement II is false
  2. Statement I is false but Statement II is true
  3. Both Statement I and Statement II are true
  4. Both Statement I and Statement II are false
Ques. 10JEE Main 2025, 23 January (Evening Shift)

The -Helix and - Pleated sheet structures of protein are associated with its :

  1. tertiary structure
  2. quaternary structure
  3. primary structure
  4. secondary structure
Ques. 11JEE Main 2025, 22 January (Morning Shift)

Which of the following acids is a vitamin ?

  1. Saccharic acid
  2. Ascorbic acid
  3. Aspartic acid
  4. Adipic acid

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