free ribosome

free ribosome

[¦frē ′rī·bə‚sōm]
(cell and molecular biology)
A ribosome located by itself or in a group (known as a polysome or polyribosome) in the cytosol, rather than bound to the endoplasmic reticulum; synthesizes soluble cytosolic proteins and most extrinsic membrane proteins.
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References in periodicals archive ?
mRNA moves out of the nucleus of the cell to a free ribosome in the cytoplasm to begin the process of protein synthesis.
In the cytoplasm there are elongated narrow cisternae of RER, mitochondria, and many free ribosomes and vesicles.
Basophylia is due to abundant free ribosomes that give the cytoplasm its granular appearance.
The cytoplasm is scarce; Golgi complexes, free ribosomes and cisterns of the rugose endoplasmic reticulum are observed in this cytoplasm.
All other proteins are synthesized by free ribosomes, which are not attached to any cell organelles.
Ultra structural studies with piperine showed an increase in microvilli length with a prominent increase in free ribosomes and ribosomes on the endoplasmic reticulum in enterocytes, suggesting that synthesis or turnover of cytoskeletal components or membrane proteins may be involved in the observed effect.
In the cytoplasm of the tumor cell, abundant free ribosomes were recognized, but Well-developed rough endoplasmic reticula were few (Figure 2, B).
The cytoplasm contains numerous free ribosomes, large mitochondria, many vesicles and vacuoles containing electron-dense material; but the rough endoplasmic reticulum and Golgi complexes are sparse (Figs.
Basophylia is due to abundant, free ribosomes that give the cytoplasm its granular appearance.
Although there were numerous free ribosomes, the granular endoplasmic reticulum was predominant, and bundles of intermediate filaments surrounded the nucleus.
Prominent immunogold labeling was observed in the epithelial cells facing the maternal blood vessels; in free ribosomes, rough endoplasmic reticulum and Golgi complex; and especially in the cytoplasmic apical region of these cells and in microvilli spreading out into the blood vessel lumen.
The cytoplasm was rich in mitochondria and free ribosomes, and contained scattered arrays of thin filaments with focal dense bodies.