The straight-chain ketose is formed. A ketosamine is a combination of two organic chemistry functional groups, ketose and amine. It has one ketone group and so is part of the ketose family. Dihydroxyacetone, the simplest ketose, is an isomer of glyceraldehyde. It is a ketose sugar formed from ribulose-5-phosphate. Sorbose is a ketose belonging to the group of sugars known as monosaccharides. A ketose is a monosaccharide containing one ketone group per molecule. This isomerization of a ketose to an aldose proceeds through an "cis"-enediol(ate) intermediate. If the sugar contains a ketone group, it is a ketose. A ketose is then formed and the ring is closed again. Ketose get dehydrated faster and hence they give the test faster.