The carbohydrate "Ribose" present in DNA, is A. A pentose sugar B. present in pyranose form C. in "D" configuration D.…
Biomolecules · Class 12 · JEE Main Previous Year Question
The carbohydrate "Ribose" present in DNA, is
A. A pentose sugar
B. present in pyranose form
C. in "D" configuration
D. a reducing sugar, when free
E. in -anomeric form
Choose the correct answer from the options given below:
- a
A, D and E Only
- b
B, D and E Only
- c
A, B and E Only
- d✓
A, C and D Only
A, C and D Only
Step 1: Pentose Classification — Ribose is a five-carbon sugar, making it a pentose. In nucleic acids, it typically exists in the .
Step 2: Chemical Properties — Free ribose exists in an equilibrium that includes an open-chain form with a free aldehyde group, making it a reducing sugar.
Step 3: Structural Form — While it can form a pyranose ring when free, in the context of nucleotides it adopts a furanose (5-membered) ring structure. The correct descriptors are A, C, and D.
Key Point: DNA contains 2-deoxy-, while RNA contains .
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