Glossary 3.4

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The glossary provides definitions and explanations of key terms and concepts essential to understand the topic in the lesson. Be sure to familiarize yourself with each term before attempting the lesson glossary quiz.
Browse the glossary using this index

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P

Poly(A) Tail

a chain of adenine nucleotides that are added to the 3' end of the pre-mRNA molecule to protect it from enzymes in the cytosol

Precursor mRNA (pre-mRNA)

the initial RNA transcription product

Promoter

a nucleotide sequence that lies just before a gene and allows for the binding of RNA polymerase