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RNA (ribonucleic acid) is a copy of DNA (deoxyribonucleic acid) that goes out into the cytoplasm to tell the cell what to do in order to stay alive. RNA is a single stranded ribonucleic acid.  Similar to DNA, its sugar is ribose not deoxyribose. Messenger RNA or mRNA is complementary to DNA. It sends a message from DNA to the cytoplasm.

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