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Biomolecules

JEE Mains Chemistry. Try each one first, then open its answer.

Top 10 JEE Mains PYQs to practise first

The questions and kinds of question asked most often come first. Each one says how often and in which papers.

  1. Question 1

    This type asked 7 times: 2021 Paper 9, 26 Jul 2022, 11 Apr 2023, 30 Jan 2024, 23 Jan 2026 S1, 28 Jan 2026 S2, 4 Apr 2026 S1. This one: 4 Apr 2026 S1 See all 7 of this type

    43
    Statement-I : The structure of maltose is given below, with the caption "Maltose is a non reducing sugar". Statement-II : The structure of lactose is given below, with the caption "Lactose is a reducing sugar". In the light of the above statements, choose the correct answer from the options given below

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  2. Question 2

    This type asked 7 times: 2021 Paper 3, 2021 Paper 19, 2021 Paper 22, 2021 Paper 26, 27 Jun 2022, 25 Jul 2022, 28 Jan 2025. This one: 28 Jan 2025 See all 7 of this type

    103
    Match List-I with List-II.
    List-I (Saccharides)List-II (Glycosidic linkages found)
    (A)Sucrose(I)α1−4\alpha 1-4
    (B)Maltose(II)α1−4\alpha 1-4 and α1−6\alpha 1-6
    (C)Lactose(III)α1−β2\alpha 1-\beta 2
    (D)Amylopectin(IV)β1−4\beta 1-4
    Choose the correct answer from the options given below:

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  3. Question 3

    This type asked 6 times: 2021 Paper 1, 2021 Paper 6, 28 Jun 2022, 10 Apr 2023, 23 Jan 2025, 5 Apr 2026 S2. This one: 5 Apr 2026 S2 See all 6 of this type

    43
    Identify the incorrect statement about tertiary structure of proteins.

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  4. Question 4

    This type asked 6 times: 2021 Paper 17, 2021 Paper 21, 28 Jun 2022, 28 Jan 2025, 7 Apr 2025, 22 Jan 2026 S1. This one: 22 Jan 2026 S1 See all 6 of this type

    40
    Given below are two statements: Statement I: Sucrose is dextrorotatory. However sucrose upon hydrolysis gives a solution having mixture of products. This solution shows laevorotation. Statement II : Hydrolysis of sucrose gives glucose and fructose. Since the laevorotation of glucose is more than the dextrorotation of fructose the resulting solution becomes laevorotatory. In the light of the above statements, choose the correct answer from the options given below.

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  5. Question 5

    This type asked 5 times: 24 Jan 2023, 29 Jan 2023, 1 Feb 2024, 2 Apr 2025, 24 Jan 2026 S2. This one: 24 Jan 2026 S2 See all 5 of this type

    28
    The number of possible tripeptides formed involving alanine (ala), glycine (gly) and valine (val), where no amino acid has been used more than once is :

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  6. Question 6

    This type asked 5 times: 29 Jun 2022, 25 Jul 2022, 27 Jan 2024, 5 Apr 2024, 21 Jan 2026 S2. This one: 21 Jan 2026 S2 See all 5 of this type

    36
    The correct statements are: (A) Activation energy for enzyme catalysed hydrolysis of sucrose is lower than that of acid catalysed hydrolysis. (B) During denaturation, secondary and tertiary structures of a protein are destroyed but primary structure remains intact. (C) Nucleotides are joined together by glycosidic linkage between C1C_{1} and C4C_{4} carbons of the pentose sugar (D) Quaternary structure of proteins represents overall folding of the polypeptide chain. Choose the correct answer from the options given below:

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  7. Question 7

    This type asked 5 times: 14 Jun 2022, 26 Jul 2022, 29 Jul 2022, 29 Jan 2024, 29 Jan 2025. This one: 29 Jan 2025 See all 5 of this type

    43
    Match List-I with List-II.
    List-I (Carbohydrate)List-II (Linkage, Source)
    (A)Amylose(I)β−C1−C4\beta-C_{1}-C_{4}, plant
    (B)Cellulose(II)α−C1−C4\alpha-C_{1}-C_{4}, animal
    (C)Glycogen(III)α−C1−C4\alpha-C_{1}-C_{4}, α−C1−C6\alpha-C_{1}-C_{6}, plant
    (D)Amylopectin(IV)α−C1−C4\alpha-C_{1}-C_{4}, plant
    Choose the correct answer from the options given below:

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  8. Question 8

    This type asked 5 times: 2021 Paper 16, 2021 Paper 21, 2021 Paper 26, 27 Jul 2022, 30 Jan 2023. This one: 30 Jan 2023 See all 5 of this type

    44
    Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Ketoses give Seliwanoff's test faster than Aldoses. Reason (R): Ketoses undergo β\beta-elimination followed by formation of furfural. In the light of the above statements, choose the correct answer from the options given below:

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  9. Question 9

    This type asked 4 times: 2021 Paper 10, 2021 Paper 25, 6 Apr 2023, 6 Apr 2026 S1. This one: 6 Apr 2026 S1 See all 4 of this type

    44
    Match List-I with List-II:
    List-I Deficiency DiseaseList-II Vitamin
    (A)Scurvy(I)Pyridoxine
    (B)Convulsions(II)Vitamin A
    (C)Cheilosis(III)Ascorbic Acid
    (D)Xerophthalmia(IV)Riboflavin
    Choose the correct answer from the options given below :

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  10. Question 10

    This type asked 4 times: 27 Jun 2022, 31 Jan 2023, 11 Apr 2023, 4 Apr 2026 S2. This one: 4 Apr 2026 S2 See all 4 of this type

    43
    A D-aldotetrose on oxidation with concentrated HNO3HNO_{3} resulted in an optically inactive dicarboxylic acid. The structure of the D-aldotetrose is :

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