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Biomolecules · Question 5

NEET (UG) 2025MCQEasy📈 Topic in 25% papers+4−1
1

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

Answer

(4) D-Fructose

Solution

As per NCERT, fructose is obtained from honey and fruits; it is a ketohexose (keto sugar), exists in two cyclic forms ( - and -anomers of the furanose ring) and is laevorotatory, hence named D-(−)-fructose.

Glucose is an aldose and is dextrorotatory; maltose and sucrose are disaccharides, not keto sugars.

∴ 'X' is D-fructose.

Answer: (4)

NEET (UG) 2025

Keep practising — Biomolecules

2

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
3

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
4

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
5

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
6

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
7

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)
8

The RBC deficiency is deficiency disease of :

  1. Vitamin B2
  2. Vitamin B12
  3. Vitamin B6
  4. Vitamin B1
Out of syllabusNEET (UG) 2021
9

Which of the following is a basic amino acid?

  1. Alanine
  2. Tyrosine
  3. Lysine
  4. Serine
NEET (UG) 2020
10

Sucrose on hydrolysis gives :

  1. -D-Glucose + -D-Glucose
  2. -D-Glucose + -D-Fructose
  3. -D-Fructose + -D-Fructose
  4. -D-Glucose + -D-Fructose
NEET (UG) 2020
11

The non-essential amino acid among the following is :

  1. alanine
  2. lysine
  3. valine
  4. leucine
NEET (UG) 2019

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