The central dogma of biology describes the process by which DNA is transcribed into RNA and then translated into protein. There are three main types of RNA - messenger RNA carries instructions from DNA to the ribosome, ribosomal RNA binds to mRNA and assembles amino acids into proteins, and transfer RNA delivers amino acids to be assembled into proteins. Transcription is the process by which mRNA is copied from DNA, and translation is the process by which the mRNA code is used to assemble amino acids into proteins at the ribosome.