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Biomolecules · Question 19

JEE Main 2026 (Online) 22nd January Morning ShiftMCQEasy📈 Topic in 16% papers+4−1
1

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

Answer

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

Solution

As per NCERT, sucrose is dextrorotatory ([ ]D = +66.5 ).

C12H22O11 + H2O H+ C6H12O6 + C6H12O6

(sucrose → D-(+)-glucose + D-(−)-fructose)

Glucose is dextrorotatory (+52.5 ) and fructose is laevorotatory (-92.4 ).

The laevorotation of fructose is more than the dextrorotation of glucose, the mixture is laevorotatory (invert sugar).

Statement I is true.

Statement II interchanges the two: glucose is dextrorotatory, not laevorotatory Statement II is false.

Answer: (3)

JEE Main 2026 (Online) 22nd January Morning Shift

Keep practising — Biomolecules

2

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
JEE Main 2026 (Online) 22nd January Evening Shift
3

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
JEE Main 2026 (Online) 21st January Morning Shift
4

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
JEE Main 2026 (Online) 21st January Evening Shift
5

[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]
JEE Main 2025 (Online) 8th April Evening Shift
6

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
JEE Main 2025 (Online) 7th April Morning Shift
7

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
JEE Main 2025 (Online) 7th April Evening Shift
8

Identify the pair of reactants that upon reaction, with elimination of HCl will give rise to the dipeptide Gly-Ala.

  1. NH2-CH2-COOH and NH2- CH3 |CH-COOH
  2. NH2-CH2-COCl and NH3- CH3 |CH-COCl
  3. NH2-CH2-COCl and NH2- CH3 |CH-COOH
  4. NH2-CH2-COOH and NH2- CH3 |CH-COCl
JEE Main 2025 (Online) 4th April Morning Shift
9

The total number of hydrogen bonds of a DNA-double Helix strand whose one strand has the following sequence of bases is . 5'-G-G-C-A-A-A-T-C-G-G-C-T-A-3'

JEE Main 2025 (Online) 4th April Morning Shift
10

A dipeptide, "x" on complete hydrolysis gives "y" and "z". "y" on treatment with aq. HNO2 produces lactic acid. On the other hand "z" on heating gives the following cyclic molecule. [figure] Based on the information given, the dipeptide "x" is :

  1. alanine-alanine
  2. valine-glycine
  3. valine-leucine
  4. alanine-glycine
JEE Main 2025 (Online) 4th April Evening Shift
11

Which of the following is the correct structure of L-Fructose?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
JEE Main 2025 (Online) 3rd April Morning Shift

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