Ribonucleic+acid

Ribonucleic Acid or RNA is a major macromolecule essential for all known life. When RNA is synthesized during the process known as transcription it is usually catalyzed by a RNA polymerase. The DNA double helix unwinds and the polymerase synthesizes the complementary RNA strand. One big difference between RNA and DNA is that RNA has Uracil instead of the Thiamine found in DNA. Other differences between RNA and DNA are: RNA is a single-stranded molecule in many of its biological roles and has a much shorter chain of nucleotides, DNA are double stranded. And lastly, RNA includes ribose, where DNA contains deoxyribose.