The simplest sugar; has the general formula of two hydrogen atoms per one oxygen atom and one carbon atom.
A mnemonic exists to help one remember eight six-carbon, ketone monosaccharides:
All Altruists Gladly Make Fruity Gum In Gallon Tanks:
allose, altrose, glucose, mannose, fructose, gulose, idose, galactose (aka lactose), talose
From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.