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Ribosome - Dictionary Definition and Overview |
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Ribosome : (noun)
1: an organelle in the cytoplasm of a living cell; ribosomes
attach to mRNA and move down it one codon at a time and
stop until tRNA brings the required amino acid; when a
ribosome reaches a stop codon it falls apart and releases
the completed protein molecule for use by the cell; "the
ribosome is the site of protein synthesis"
Based on WordNet 2.0
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Ribosome : Ribosome: The cell's essential RNA and protein but this is not the full story.
Molecular maps of the ribosome have revealed startling details about its structure that boost support for an "RNA world" as the model for the origin of life on Earth. Although the ribosome consists
of both ribosomal RNA (rRNA) and protein, the "active site" on the large unit of the ribosome -- the site of the molecule that can catalyze its chemical reactions. RNA's starring role in the
ribosome may thus support the idea that life on Earth began with RNA.
Based on WordNet (r) 2.0 (August 2003)
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