NCIt definition : Ribosomes are small organelles composed of ribosomal RNA (rRNA) and 80 some different
proteins. rRNA is synthesized in the nucleolus and the ribosomal subunits are assembled
there from rRNA and imported cytoplasmic made proteins. Once assembled, the subunits
pass through the nuclear pores to the cytoplasm where they take part in protein synthesis.
Some ribosomes are free in the cytoplasm and can be recruited to a polyribosomal structure
when a messenger RNA (mRNA) strand is to be translated into a cytoplasmic protein.
Other ribosomes are attached to the endoplasmic reticulum where the protein is formed
within the interior to the endoplasmic reticulum. These proteins are destined for
secretion, storage or incorporation into membranes.;
Alternative definition : NCI-GLOSS: In biology, a structure found inside cells that is involved in making proteins.
Ribosomes help link amino acids together to form proteins.;