Monosaccharide
        Functional Group: OH (hydroxyl)
        Distinguished by # of Carbon and place of Carbonyl group
        Main source of fuel for Cellular Respiration
        Carbon skeletons are raw material to produce other macromolecules 
        Monosaccharides: (Isomers)
        Isomers are compounds containing same number of Atoms. In monosaccharides, they are formed by 6Carbons, 12Hydrogens and 6Oxygens
        Glucose
        Fructose
        Galactose
        
        Fructose and Galactose are isomers of glucose, they will be converted to Glucose before cellular respiration to enter Glycolysis.