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Biomolecules · Question 3

RE-NEET (UG) 2026MCQEasy📈 Topic in 12% papers+4−1
1

The amino acid that gives a red-blood colour on treating its sodium fusion extract with sodium nitroprusside is

  1. serine
  2. leucine
  3. threonine
  4. methionine

Answer

(4) methionine

Solution

Methionine is a sulfur-containing amino acid. In Lassaigne's test, sulfur forms sodium sulfide (Na2S) during sodium fusion, which gives a characteristic colour with sodium nitroprusside (violet, as per NCERT), showing the presence of sulphur. Among the options, only methionine contains sulphur.

Answer: (4)

RE-NEET (UG) 2026

Keep practising — Biomolecules

2

Match the vitamins in List I with their sources in List II

  1. A-III, B-I, C-IV, D-II
  2. A-II, B-III, C-IV, D-I
  3. A-IV, B-I, C-II, D-III
  4. A-IV, B-II, C-I, D-III
RE-NEET (UG) 2026
3

Sugar 'X' A. is found in honey B. is a keto sugar C. exists in and -anomeric forms. D. Is laevorotatory. 'X' is :

  1. Maltose
  2. Sucrose
  3. D-Glucose
  4. D-Fructose
NEET (UG) 2025
4

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-IV, B-III, C-II, D-I
  3. A-I, B-III, C-II, D-IV
  4. A-IV, B-III, C-I, D-II
NEET (UG) 2025
5

The reagents with which glucose does not react to give the corresponding tests/products are Choose the correct options from the given below:

  1. B and C
  2. A and D
  3. B and E
  4. E and D
NEET (UG) 2024
6

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.
RE-NEET (UG) 2024
7

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 true but Statement II is false
  3. Statement I is false but Statement II is true
  4. Both Statement I and Statement II are true
NEET (UG) 2023
8

The incorrect statement regarding enzymes is

  1. Enzymes are biocatalysts.
  2. Like chemical catalysts enzymes reduce the activation energy of bio processes.
  3. Enzymes are polysaccharides.
  4. Enzymes are very specific for a particular reaction and substrate.
NEET (UG) 2022
9

The incorrect statement about denaturation of proteins is :

  1. Uncoiling of the helical structure takes place
  2. It results due to change of temperature and/or pH
  3. It results in loss of biological activity of proteins
  4. A protein is formed from amino acids linked by peptide bonds
NEET (UG) 2022 (Phase 2)
10

The RBC deficiency is deficiency disease of :

  1. Vitamin B2
  2. Vitamin B12
  3. Vitamin B6
  4. Vitamin B1
Out of syllabusNEET (UG) 2021
11

Which of the following is a basic amino acid?

  1. Alanine
  2. Tyrosine
  3. Lysine
  4. Serine
NEET (UG) 2020

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