are of two types: and RNA. The difference between them lies in the type of they use in their sugar-phosphate backbone and in the they use.
In life today DNA is mainly used to store information in , while RNA is used to carry the information from the DNA to the , as well as by the protein building system itself. In addition some carry RNA, while others carry DNA.
Some people believe that RNA was used by life before DNA, since it is more closely involved with the protein building system, which is fundamental to the process of life.
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