The carbohydrates "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 α-anomeric form

(a) A, C and D Only \quad (b

Question

The carbohydrates "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 α-anomeric form

(a) A, C and D Only \quad (b) A, B and E Only \quad (c) B, D and E Only \quad (d) A, B and D Only

Canvas Classes · Accepted Answer

Note: The ribose in DNA is actually 2-deoxy-D-ribose (β-D-2-deoxyribose).

Evaluating each statement:

- (A) Pentose sugar — ✅ TRUE. Ribose/deoxyribose has 5 carbons.

- (B) Pyranose form — ❌ FALSE. In DNA, deoxyribose exists in furanose form (5-membered ring), not pyranose (6-membered ring).

- (C) D-configuration — ✅ TRUE. It is D-ribose (OH on right at C4 in Fischer projection).

- (D) Reducing sugar when free — ✅ TRUE. Free deoxyribose has a free anomeric –OH → can reduce Fehling's/Tollens'

More questions from Biomolecules