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==Function==
==Function==
RNA performs a wide variety of functions within the cell. Types of RNA are specified by the functions that they perform.
RNA performs a wide variety of functions within the cell. Types of RNA are specified by the functions that they perform. More than 21 functional classes of RNA have been identified, the most common types are described below.
===mRNA===
===mRNA===
The 28S rRNA (23S rRNA in prokaryotes) is a [[ribozyme]], and is responsible for the aminoacyltransferase (polypeptide-lengthening) activity of the ribosome.
The 28S rRNA (23S rRNA in prokaryotes) is a [[ribozyme]], and is responsible for the aminoacyltransferase (polypeptide-lengthening) activity of the ribosome.
===tRNA===
''Transfer RNAs'' ([[tRNA]]) are the ''adapter molecules'' that recognize ''codons'' during translation and bring specific [[amino acids]] to the [[ribosome]] to be added to the growing [[protein|polypeptide]] chain.
The "cloverleaf" tertiary structure of tRNAs is a common textbook example of the link between RNA structure and function.
==References==
==References==