alleryStart learning →A sugar that carries an aldehyde group rather than a ketone group is called what?
AA ketose sugar
BA triose sugar
CA pentose sugar
DAn aldose sugar
Answer & Solution
Correct answer: D. An aldose sugar
1. Monosaccharides are named partly by the functional group they carry.
2. An aldehyde group, written R-CHO, makes the sugar an aldose.
3. A ketone group instead makes the sugar a ketose, so that option names the opposite case.
4. Triose and pentose refer to the number of carbons, not to the functional group, so they answer a different question.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 3 "Biological Macromolecules", section 3.2 Carbohydrates_
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