what is the backbone of mRNA formed by
Split and merge into it. Answer by Banana54. Confidence votes 2.7K. Like DNA, the backbone of RNA consists of a sugar molecule and a phosphate group; the difference is that in RNA the sugar is ribose, whereas in DNA it's deoxyribose.Minor edit?plit and merge into it. Answer by Banana54. Confidence votes 2.7K. Like DNA, the backbone of RNA consists of a sugar molecule and a phosphate group; the difference is that in RNA the sugar is ribose, whereas in DNA it's deoxyribose.