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RNA has lots of functions.

mRNA - messenger RNA - is a "copy" of the DNA base sequence of a gene after processing (capping, addition of 3' tail and splicing). It is used to transfer the genetic information from DNA, which is a storage molecule and quite inaccessible, to ribosomes, which perform translation to synthesise polypeptides.

tRNA - transfer RNA - is "charged" with an amino acid and used to recognize the code in the mRNA and "translate" it into the amino acid it is carrying. There are specific tRNA molecules for each amino acid.

rRNA - Ribosomal ribonucleic acid is the RNA component of the ribosome, the protein manufacturing machinery of all living cells. Ribosomal RNA provides a mechanism for decoding mRNA intoamino acids and interacts with tRNAs during translation by providing peptidyl transferase activity. The tRNAs bring the necessary amino acids corresponding to the appropriate mRNA codon.

snRNA - small nuclear RNA - regulates and provides the catalytic machinery for splicing or mRNA.

gRNA - guide RNA - directs editing of RNA to specific sites.

miRNA - micro RNA - inhibits translation by base pairing with complementary sequences of mRNA.

Signal Recognition Particle - RNA/protein molecule that binds to the "Signal Sequence" on polypeptides to be sent to the endoplasmic reticulum, causing translation to pause until polypeptide has been fed into translocon for entry into ER.

There are others too....
RNA is a nucleic acid involved in protein synthesis. In some organisms it is also responsible for carrying the genetic code.

mRNA carries a copy of the instructions from the DNA in the nucleus to the ribosomes.

rRNA is a major component of ribosomes - the site of protein synthesis.

tRNA carries the amino acids which are added to the polypeptide chain (protein) being synthesized. It helps copy DNA and transfer it to other cells.

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