RNA

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RNA (ribonucleic acid), a nucleic acid similar to DNA (see this), but instead of thymine, one of the bases is uracil. There are three kinds of RNA. Messenger RNA is a copy of one gene copied during transcription from DNA, and it usually gives a code for one protein molecule. Transfer RNA transfers one amino acid at a time to a nascent protein in the ribosome. Ribosomal RNA functions in ribosomes. To learn more of these, grab any modern biology textbook.