Which statement is true about glucose?

• A. It is an aldose derived from five-carbon sugars.
• B. It is a ketose with six carbon atoms.
• C. It is an aldohexose.
• D. It is a disaccharide.

Answer: (C)

Glucose is an aldohexose. That means it is a six-carbon sugar (a hexose) that contains an aldehyde group at the end of the chain, classifying it as an aldose. It isn’t a ketose (which would have a ketone group, like fructose) and it isn’t a disaccharide (two monosaccharide units linked together). So describing glucose as an aldohexose accurately captures both its carbon count and its functional group.