<prompt> Biosynthesis of glucuronic acid requires theOxidation of UDP glucoseOxidation of glucose 6-phosphateOxidation of 6-phophoguconateOxidanation of glucose  <response>: Glucuronic acid is a sugar acid derived from glucose, with its sixth carbon atom oxidized to a carboxylic acid. In living beings, this primary oxidation occurs with UDP-a-D-glucose UDPG, not with the free sugar.Ref: DM Vasudevan, 7th edition, page no: 120 