Ribose Sugar. The sugar found in RNA (as opposed to deoxyribose in DNA). Ribose is a 5-carbon sugar, and has one more oxygen on it than deoxyribose does. At the center of each RNA nucleotide is a 5 carbon sugar-ribose sugar, attached to that is the phosphate group & a nitrogenous bases.eoxyribose sugar. Deoxyribose is the sugar molecules found in DNA. They have one less oxygen atom than ribose sugar which is found in RNA. The backbone of the DNA is made up of phosphate and deoxyribose.