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Medical Definition of histone. : any of various simple water-soluble proteins that are rich in the basic amino acids lysine and arginine and are complexed with DNA in the nucleosomes of eukaryotic chromatin.
Definition: A keytone is a compound containing a carbonyl functional group bridging two groups of atoms. The general formula for a ketone is RC(=O)R' where R and R' are alkyl or aryl groups. IUPAC ketone functional group names contain oxo or keto.Ketones are named by changing the-e on the end of the parent alkane name to-one. Examples: Acetone is a ketone. The carbonyl group is connected to the alkane propane, therefore the IUPAC name for acetone would be propanone.UPAC ketone functional group names contain oxo or keto. Ketones are named by changing the-e on the end of the parent alkane name to-one. Examples: Acetone is a ketone.