Free and Bound Ribosomes Bailey James

Free Ribosomes

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Free ribosomes are found in the cytoplasm of the cell

Not attached to any structures within the cell

"Free Floating" and have the ability to move freely throughout the cell

Can group together to form polysomes

Polysomes: A cluster of ribosomes held together by a strand of messenger RNA that each ribosome is translating.

Free ribosomes can be seen floating freely within the cytoplasm

Free ribosomes produce proteins that stay and are used within the cell

Various types of proteins are produced by free ribosomes

Proteins that function in Metabolism: Free ribosomes produce enzymes that are involved in the metabolism of glucose

Glucose is important to cells because it is used in both eukaryotic plant and animal cells, and functions in energy.

In eukaryotic animal cells, glucose is converted to glycogen and is used in several areas of the body, specifically in the liver.

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Translation: Free ribosomes translate mRNA for protein synthesis

The proteins produced by free ribosomal transcription are used within the cytosol

Free ribosomes are determined by the proteins they make

Bound Ribsosomes

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Found attached to the Rough Endoplasmic Reticulum

Bound ribosomes are responsible for giving the Rough E.R. a bumpy texture, and are attached to the cytosolic side of the Rough E.R.

Bound ribosomes cannot travel around the cell like free ribosomes can

In this image, a bound ribosome can be seen. How and where it is attached to the Rough Endoplasmic Reticulum can also be seen.

Bound ribosomes produce proteins that either travel out of the cell or embed into the cellular membrane

Producing Digestive Enzymes: Ribosomes bound to the Rough E.R. produce enzymes during protein synthesis.

Once produced, these enzymes are sent outside the cell to assist in other areas of the organism, where they are used for digestion

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Polypeptide Hormones: As certain proteins are produced, they hold the function of chemical signaling. These proteins are spread throughout the cell, and outside the cell

Maintains chemical stability within cells and allows for proper secretion of material throughout cell (i.e- the pancreas with insulin)

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Membrane-Bound Proteins: Proteins produced by bound ribosomes function in the membrane.

Integral proteins, surface receptors, and cell signaling

Integral Proteins: Assist molecules in travelling through the phospholipid bilayer that could not do so on their own.

Surface Receptors: Known as transmembrane receptors, function in identifying molecules as they approach and try to enter the cell

Cell Signaling: Proteins produced by the bound ribosomes also have the function of cell signaling in the cell membrane.

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Translation: Function in translating mRNA for protein synthesis

The proteins produced here will travel outside the cell.

Proteins not used in the cell membrane are stored in vesicles

Works Cited

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Created By
Bailey James


Created with images by eLife - the journal - "Multi-coloured representation of the Plasmodium falciparum 80S ribosome bound to emetine (in cyan spheres)"

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