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A sugar carrying an aldehyde functional group is classified as:
AA ketose
BA pentose
CA hexose
DAn aldose
Answer & Solution
Correct answer: D. An aldose
1. Monosaccharides are sorted by which carbonyl-containing group they carry.
2. A sugar with a ketone group is a ketose.
3. A sugar with an aldehyde group of structure R-CHO is an aldose.
4. Pentose and hexose are wrong because those names count carbons, not functional groups.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 3 'Biological Macromolecules', sections 3.1-3.5_
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