1. It is the opposite in an-configuration furanose . 2. If it does bind the furanose ring, it next opens the ring. 3. G5 hydrogen bonds to the furanose oxygen of C17, helping to position it for in-line attack. 4. The furanose ring will have either alpha or beta configuration, depending on which direction the anomeric hydroxy group is pointing. 5. In a-configuration furanose , alpha configuration has the hydroxy pointing down, and beta has the hydroxy pointing up. 6. With hexoses, short reactions times usually lead to furanose ring forms, and longer reaction times lead to pyranose forms. 7. A furanose ring structure consists of four carbon and one oxygen atom with the anomeric carbon to the right of the oxygen. 8. In aqueous solution ribose is 75 % pyranose and 25 % furanose and a different acetal "'4 "'is formed. 9. Both types of pentoses in DNA and RNA are in their ?-furanose ( closed five-membered ring ) form and they define the identity of a nucleic acid. 10. The ( much rarer ) reaction between C-1 and C-4 creates a molecule with a five-membered ring, called furanose , after the cyclic ether furan.
Mobile