Biomolecules

CBSE Class 12 · Chemistry · 23 past questions

1. Q1 2026

   The base which is present in DNA but not in RNA is…

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2. Q2 2026

   Proteins are polymers of α-amino acids which are joined to each other by…

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3. Q3 2026

   Which of the following reactions is not explained by the open chain structure of glucose ?

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4. Q4 2026

   For question number 13 to 16, two statements are given – one labelled as Assertion (A) and the other labelled…

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5. Q5 2026

   The deficiency of which of the following vitamins causes increased fragility of red blood cells and muscular…

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6. Q6 2026

   On hydrolysis, which of the following carbohydrates gives only glucose ?

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7. Q7 2025

   Which of the following is/are examples of denaturation of protein ?

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8. Q8 2025

   Nucleotides are joined together by

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9. Q9 2025

   Scurvy is caused due to deficiency of

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10. Q10 2025

    For question number 13 to 16, two statements are given – one labelled as Assertion (A) and the other labelled…

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11. Q11 2025

    Which of the following statements is not true about glucose ?

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12. Q12 2025

    For questions number 13 to 16, two statements are given – one labelled as Assertion (A) and the other…

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13. Q13 2024

    For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other…

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14. Q14 2024

    The vitamin which plays an important role in coagulating blood is…

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15. Q15 2024

    Two among the three components of DNA are β-D-2-deoxyribose and a heterocyclic base. The third component is…

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16. Q16 2024

    Which functional groups of glucose interact to form cyclic hemiacetal leading to pyranose structure ?

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17. Q17 2024

    What happens when D-glucose is treated with the following reagents ?

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18. Q18 2024

    Answer the following : (any three)

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19. Q19 2023

    An α-helix is a structural feature of

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20. Q20 2023

    Aspirin is obtained by the acetylation of which of the following compounds ?

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21. Q21 2023

    On hydrolysis, which of the following carbohydrates gives only glucose ?

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22. Q22 2023

    Which of the following vitamins is water soluble ?

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23. Q23 2023

    An $\alpha$-helix is a structural feature of…

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