The carbohydrates "Ribose" present in DNA, is A. A pentose sugar B. present in pyranose from C. in "D" configuration D. a reducing sugar, when free E. in alpha -anomeric form Choose the correct answer from the options given below:

The specific carbohydrate residue present across backbone units in DNA molecules is beta-2-deoxy-D-ribose. Its spatial parameters satisfy the following conditions: - It is a 5-carbon pentose sugars skeleton structure (A). - It maintains a canonical D configuration pathway sequence (C). - When localized in free, open unlinked molecular solutions, it standardly functions as a reducing carbohydrate assembly agent (D). - It exists predominantly in a furanose cycle form inside DNA, rather than a pyranose ring. Ribose in nucleic acids occurs primarily as a five-membered furanose ring configuration system. Class 12 Chemistry: Biomolecules

The carbohydrates "Ribose" present in DNA, is A. A pentose sugar B. present in pyranose from C. in "D" configuration D. a reducing sugar, when free E. in alpha -anomeric form Choose the correct answer

The specific carbohydrate residue present across backbone units in DNA molecules is beta-2-deoxy-D-ribose. Its spatial parameters satisfy the following conditions: - It is a 5-carbon pentose sugars skeleton structure (A). - It maintains a canonical D configuration pathway sequence (C). - When localized in free, open unlinked molecular solutions, it standardly functions as a reducing carbohydrate assembly agent (D). - It exists predominantly in a furanose cycle form inside DNA, rather than a pyra

The carbohydrates "Ribose" present in DNA, is A. A pentose sugar B. present in pyranose from C. in "D" configuration D. a reducing sugar, when free E. in alpha -anomeric form Choose the correct answer from the options given below:

The specific carbohydrate residue present across backbone units in DNA molecules is beta-2-deoxy-D-ribose. Its spatial parameters satisfy the following conditions: - It is a 5-carbon pentose sugars skeleton structure (A). - It maintains a canonical D configuration pathway sequence (C). - When localized in free, open unlinked molecular solutions, it standardly functions as a reducing carbohydrate assembly agent (D). - It exists predominantly in a furanose cycle form inside DNA, rather than a pyranose ring. Ribose in nucleic acids occurs primarily as a five-membered furanose ring configuration system. Class 12 Chemistry: Biomolecules

The carbohydrates "Ribose" present in DNA, is A. A pentose sugar B. present in pyranose from C. in "D" configuration D. a reducing sugar, when free E. in alpha -anomeric form Choose the correct answer

The specific carbohydrate residue present across backbone units in DNA molecules is beta-2-deoxy-D-ribose. Its spatial parameters satisfy the following conditions: - It is a 5-carbon pentose sugars skeleton structure (A). - It maintains a canonical D configuration pathway sequence (C). - When localized in free, open unlinked molecular solutions, it standardly functions as a reducing carbohydrate assembly agent (D). - It exists predominantly in a furanose cycle form inside DNA, rather than a pyra

The carbohydrates "Ribose" present in DNA, is A. A pentose sugar B. present in pyranose from C. in "D" configuration D…

Year	2026	2025	2024	Total
Questions	9	19	8	36

Year

2026

2025

2024

Total

Questions

Solution & Explanation

Core Logic

The specific carbohydrate residue present across backbone units in DNA molecules is $β$ $\beta$-2-deoxy-D-ribose. Its spatial parameters satisfy the following conditions:

It is a 5-carbon pentose sugars skeleton structure (A).
It maintains a canonical D configuration pathway sequence (C).
When localized in free, open unlinked molecular solutions, it standardly functions as a reducing carbohydrate assembly agent (D).
It exists predominantly in a furanose cycle form inside DNA, rather than a pyranose ring.
Carbohydrates - Nucleic Acids component diagram for Q36 - JEE Main 2025 Morning

Pattern Recognition

Ribose in nucleic acids occurs primarily as a five-membered furanose ring configuration system.

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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)

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Class 12 Chemistry: Biomolecules

The carbohydrates "Ribose" present in DNA, is A. A pentose sugar B. present in pyranose from C. in "D" configuration D. a reducing sugar, when free E. in $α$ $\alpha$ -anomeric form Choose the correct answer from the options given below:

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The carbohydrates "Ribose" present in DNA, is A. A pentose sugar B. present in pyranose from C. in "D" configuration D. a reducing sugar, when free E. in α$\alpha$ -anomeric form Choose the correct answer from the options given below:

Solution & Explanation

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More Biomolecules Previous-Year Questions — Page 8

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The carbohydrates "Ribose" present in DNA, is A. A pentose sugar B. present in pyranose from C. in "D" configuration D. a reducing sugar, when free E. in $α$ $\alpha$ -anomeric form Choose the correct answer from the options given below: