- The pentose that, as the d-isomer, is present in ribonucleic acid; epimers of d-r. are d-arabinose, d-xylose, and l-lyxose.
* * *ri·bose 'rī-.bōs, -.bōz n a pentose C5H10O5 found esp. in the levorotatory D-form as a constituent of a number of nucleosides (as adenosine, cytidine, and guanosine) esp. in RNA
* * *n.a pentose sugar (i.e. one with free carbon atoms) that is a component of RNA and several coenzymes. Ribose is also involved in intracellular metabolism.
* * *ri·bose (riґbōs) an aldopentose found in riboflavin and ribonucleic acid (RNA) as well as in free ribonucleosides and ribonucleotides.
Medical dictionary. 2011.