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Sugar Epimers

BIOCHM-HHZR4L

${D}$-Glucose and ${D}$-mannose are epimers of each other; what does that mean?

A

One is a furanose and the other is a pyranose.

B

One is an aldose and the other is a ketose.

C

One has exactly one more carbon than the other.

D

They differ in stereochemistry around exactly one carbon.

E

They rotate plane-polarized light in the same direction.