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Which image represents the proper convention for carbon numbering of cyclic sugars?
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- 1. Introduction to Biochemistry4h 36m
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9. Carbohydrates
Cyclic Monosaccharides
Multiple Choice
Below is the structure for a cyclic D-monosaccharide. Which labeled carbon is the anomeric carbon?
A
A
B
B
C
C
D
D
E
E
F
F
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검증된 단계별 안내1
Identify the cyclic structure as a pyranose, which is a six-membered ring containing an oxygen atom.
Recognize that the anomeric carbon is the carbon that was the carbonyl carbon (either aldehyde or ketone) in the acyclic form of the sugar.
In the cyclic form, the anomeric carbon is the one directly bonded to two oxygen atoms: one in the ring and one as a hydroxyl group.
Examine the structure and locate the carbon that is bonded to the ring oxygen and also has a hydroxyl group attached.
Determine that the labeled carbon 'B' is the anomeric carbon, as it fits the criteria of being bonded to two oxygen atoms.
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