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 C1 and C4 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:

- A is correct: Enzymes lower activation energy significantly. - B is correct: Denaturation affects secondary and tertiary structures while primary structure remains intact. - C is incorrect: Nucleotides are joined by phosphodiester linkages, and glycosidic linkages connect bases to sugars. - D is incorrect: Quaternary structure represents aggregation of multiple polypeptide subunits, not single chain folding. Only statements A and B are correct, matching option (3). Sees: Biomolecules structural and enzymatic properties. Trap: Confusing primary structure disruption with denaturation. Class 12 Chemistry: Biomolecules

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 o

- A is correct: Enzymes lower activation energy significantly. - B is correct: Denaturation affects secondary and tertiary structures while primary structure remains intact. - C is incorrect: Nucleotides are joined by phosphodiester linkages, and glycosidic linkages connect bases to sugars. - D is incorrect: Quaternary structure represents aggregation of multiple polypeptide subunits, not single chain folding. Only statements A and B are correct, matching option (3). Sees: Biomolecules structura

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 C1 and C4 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:

- A is correct: Enzymes lower activation energy significantly. - B is correct: Denaturation affects secondary and tertiary structures while primary structure remains intact. - C is incorrect: Nucleotides are joined by phosphodiester linkages, and glycosidic linkages connect bases to sugars. - D is incorrect: Quaternary structure represents aggregation of multiple polypeptide subunits, not single chain folding. Only statements A and B are correct, matching option (3). Sees: Biomolecules structural and enzymatic properties. Trap: Confusing primary structure disruption with denaturation. Class 12 Chemistry: Biomolecules

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 o

- A is correct: Enzymes lower activation energy significantly. - B is correct: Denaturation affects secondary and tertiary structures while primary structure remains intact. - C is incorrect: Nucleotides are joined by phosphodiester linkages, and glycosidic linkages connect bases to sugars. - D is incorrect: Quaternary structure represents aggregation of multiple polypeptide subunits, not single chain folding. Only statements A and B are correct, matching option (3). Sees: Biomolecules structura

The correct statements are: A. Activation energy for enzyme catalysed hydrolysis of sucrose is lower than that of acid…

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Questions	9	19	8	36

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2026

2025

2024

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Questions

Solution & Explanation

Core Logic

A is correct: Enzymes lower activation energy significantly.
B is correct: Denaturation affects secondary and tertiary structures while primary structure remains intact.
C is incorrect: Nucleotides are joined by phosphodiester linkages, and glycosidic linkages connect bases to sugars.
D is incorrect: Quaternary structure represents aggregation of multiple polypeptide subunits, not single chain folding.

Step 1: Final Conclusion

Only statements A and B are correct, matching option (3).

Pattern Recognition

Sees: Biomolecules structural and enzymatic properties. Trap: Confusing primary structure disruption with denaturation.

Chapter Mix

Class 12 Chemistry: Biomolecules

More Biomolecules Previous-Year Questions — Page 8

Q78 jee_main_2024_31_jan_morning Reactions of Glucose

Match List I with List II

LIST-I	LIST-II
A. Glucose/ $NaHCO₃$ $NaHCO_3$/ $Δ$ $\Delta$	I. Gluconic acid
B. Glucose/ $HNO₃$ $HNO_3$	II. No reaction
C. Glucose/HI/ $Δ$ $\Delta$	III. n-hexane
D. Glucose/Bromine water	IV. Saccharic acid

Choose the correct answer from the options given below:

A. $A-IV, B-I, C-III, D-II$ $\text{A-IV, B-I, C-III, D-II}$
B. $A-II, B-IV, C-III, D-I$ $\text{A-II, B-IV, C-III, D-I}$
C. $A-III, B-II, C-I, D-IV$ $\text{A-III, B-II, C-I, D-IV}$
D. $A-I, B-IV, C-III, D-II$ $\text{A-I, B-IV, C-III, D-II}$

Solution

Core Logic

Matching the reactions of glucose: (A) Glucose does not react with $NaHCO₃$ $NaHCO_3$, so there is no reaction. (A $arrow$ $\rightarrow$ II) (B) Oxidation of glucose with strong oxidizing agents like $HNO₃$ $HNO_3$ yields a dicarboxylic acid called saccharic acid. (B $arrow$ $\rightarrow$ IV) (C) Prolonged heating of glucose with $HI$ $HI$ forms n-hexane, indicating a straight chain of six carbon atoms. (C $arrow$ $\rightarrow$ III) (D) Oxidation with mild agents like bromine water converts glucose to gluconic acid. (D $arrow$ $\rightarrow$ I)

Chapter Mix

Class 12 Chemistry: Biomolecules

Solution & Explanation

Core Logic

Step 1: Final Conclusion

Pattern Recognition

Chapter Mix

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