A minute particle consisting of RNA and associated proteins, found in large numbers in the cytoplasm of living cells. They bind messenger RNA and transfer RNA to synthesize polypeptides and proteins.
- ‘The smallest RNA component of almost all ribosomes is 5S ribosomal RNA.’
- ‘Since these patterns are almost identical, it would appear that HMP associates with ribosomes or ribosomal proteins.’
- ‘Motors, such as RNA polymerases and ribosomes, produce trailing strands of mRNA and protein, respectively.’
- ‘Thus transcribing RNA polymerases and ribosomes may all be bound to the same RNA molecule while marching in the same direction.’
- ‘This necessitated a mechanism for the import of the now nucleus-encoded proteins, which are synthesized at free ribosomes in the cytoplasm.’
1950s: from ribonucleic acid + -some.