<prompt> 6 membered ring structure of monosaccharides are known as:PyranFuranAldoseKetose  <response>: The ring structures of monosaccharides are similar to the ring structures of either pyran a six-membered ring or furan a five-membered ring. For glucose in solution, more than 99 is in the pyranose form. Ref: Harper 28th edition, chapter 14. 