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A '''Ribonucleic acid''' (RNA) is a molecule found in all cells, comprised of many individual units of [[nucleic acid]].  It differs from DNA ([[deoxyribonucleic acid]]) in that it only contains a single, not double strand, and substitutes [[uracil]] for [[thymine]].  The sugar backbone of RNA is also conposed of ribose (DNA contains deoxyribose). RNAs fall into several different categories, depending on function.   

A '''Ribonucleic acid''' (RNA) is a molecule found in all cells, comprised of many individual units of [[nucleic acid]].  It differs from DNA ([[deoxyribonucleic acid]]) in that it only contains a single, not double strand, and substitutes [[uracil]] for [[thymine]].  The sugar backbone of RNA is also composed of ribose (DNA contains deoxyribose). RNAs fall into several different categories, depending on function.   

The primary role of mRNA in is to transfer a copy of the information coded in DNA to a [[ribosome]] to be expressed as a protein, using a form of RNA known as messenger RNA ([[mRNA]]).  mRNA in eukaryotes undergoes spicing after transcription from DNA to remove [[introns]] or to use alternative splicing to create a different gene product. Alternatively-spliced transcripts can also express the same protein, but at different levels, due to the removal or addition of regulatory sequecnces.

The primary role of mRNA in is to transfer a copy of the information coded in DNA to a [[ribosome]] to be expressed as a protein, using a form of RNA known as messenger RNA ([[mRNA]]).  mRNA in eukaryotes undergoes spicing after transcription from DNA to remove [[introns]] or to use alternative splicing to create a different gene product. Alternatively-spliced transcripts can also express the same protein, but at different levels, due to the removal or addition of regulatory sequecnces.