Give examples about monosacchradis modifications

-replacement of OH in pos.2 of glucose with amino group producing glucosamine (osamines) and an acetyl group may be added to the amino group (acetyl-glucosamine) -replacement of hydroxyl group of galactose also with amino group (galactosamine) -Oxidation of the CH2OH leading to formation of COOH (uronic acid) oxidation of glucose leads to formation of glucuronic acid (precursor of vitamin C). -NANA (N-acetyl nueraminic acid) ;derived from mannose linked to lipids and proteins during their maturation in Golgi apparatues (glycosylation).