DNA is usually double stranded and most cellular RNA is single stranded. 1)In DNAthe pentose sugar is deoxyribose.Whereas in RNA the pentose sugar is ribose. 2)In DNA the common organic bases are adenine,guanine,cytosine and thymine.Whereas in RNA the common organic bases are adenine,guanine,cytosine and uracil.Dec 9, 2009