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Biomolecules

JEE Main 2025 (Online) 28th January Morning ShiftMCQEasy📈 Topic in 25% papers+4−1
Ques. 1JEE 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

Answer

(3) Statement I is false but Statement II is true

Solution

Statement I: In glucose pentaacetate all five –OH groups (including the anomeric –OH) are acetylated, so the molecule cannot open into the free aldehyde form.

As per NCERT, glucose pentaacetate does not react with hydroxylamine; for the same reason it does not react with 2,4-dinitrophenylhydrazine (no free –CHO group).

Statement I is false.

Statement II: As per NCERT, glucose is obtained commercially by the hydrolysis of starch by boiling it with H2SO4 under pressure (2–3 atm):

(C6H10O5)n + nH2O H+ nC6H12O6

Statement II is true.

Answer: (3)

Keep practising — Biomolecules

Ques. 2JEE 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. 3JEE 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. 4JEE 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. 5JEE 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. 6JEE 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. 7JEE 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. 8JEE 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
Ques. 9JEE Main 2025, 22 January (Evening Shift)

Identify the number of structure/s from the following which can be correlated to D-glyceraldehyde. [figure]

  1. three
  2. two
  3. one
  4. four
Ques. 10JEE Main 2024, 9 April (Morning Shift)

Total number of essential amino acid among the given list of amino acids is . Arginine, Phenylalanine, Aspartic acid, Cysteine, Histidine, Valine, Proline

Ques. 11JEE Main 2024, 9 April (Evening Shift)

The incorrect statement about Glucose is :

  1. Glucose remains in multiple isomeric form in its aqueous solution
  2. Glucose is soluble in water because of having aldehyde functional group
  3. Glucose is an aldohexose
  4. Glucose is one of the monomer unit in sucrose

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