[Free Registration/Login may be required to access all resource tools.] This article complete with labeled diagrams, key vocabulary terms, and review questions explains the different factors involved in transcription.

Try this quiz about RNA and the origin of life.

A stop codon is a nucleotide triplet in messenger RNA that signals the end of a protein during the translation process. Read about how this works, the different types of stop codons, and how a mutation can sometimes occur.