Why is RNA not like DNA?

DNA or deoxyribonucleic acid is composed of phosphates, a pentose sugar (in DNA deoxyribose), and one of four nitrogen containing bases (A,T,C, or G). Deoxyribose contains a singe Hydrogen atom where Ribose (the RNA sugar equivalent) contains a hydroxyl group (-OH). RNA also does not contain the DNA base, Thymine, and contains Uracil in it's place to bind to Adenine in Thymine's place.

There are many types of RNA and each of them has additional differences as well, but these are the basics of the chemical differences.

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