Which Monosaccharides is NOT a Carboxylic Acid

Question

Which monosaccharides is NOT a carboxylic acid?
A) 6-phospho-gluconate
B) gluconate
C) glucose
D) glucuronate
E) muramic acid

Accepted Answer

Glucose is a monosaccharide, but it is not a carboxylic acid as it does not contain a carboxyl group (-COOH). The other options (A, B, D, E) all contain a carboxyl group and are considered carboxylic acids.