Which of the following carbohydrates is not a component of glycoproteins?

A Glucose
B Galactose
C Ribose ✓
D Mannose

Explanation

Ribose is a component of RNA and some other molecules but not typically a component of glycoproteins, which usually contain glucose, galactose, mannose, and other sugars like N-acetylglucosamine and N-acetylgalactosamine.

Source

Harper's Illustrated Biochemistry
Carbohydrate Metabolism Biochemistry Glycoproteins and Glycolipids Easy MEDICAL Confidence: high