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Best Answer: 4) RNA contains ribose, DNA does not. DNA contain the deoxyribose sugar. Other differences may include; DNA is double stranded while RNA is single stranded. DNA contain the base thymine while RNA contain the base Uracil in place of thymine.
In the case of RNA, the sugar in question is  the ribose sugar. Ribose sugar in RNA is almost indistinguishable  from its DNA counter part deoxyribose sugar. What separates  ribose from deoxyribose, is the presence of an oxygen molecule on  the sugar's second carbon, which deoxyribose lacks.