Where are ribosomes made?
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Where are ribosomes made?


Quick Answer

According to Florida State University, ribosomes are primarily constructed in the nucleolus of all living cells. Inside the nucleolus, four strands ribosomal RNA (rRNA) bind together with ribosomal proteins. This results in two structures, called the small ribosome subunit and the large ribosome subunit. Both of these subunits travel through pores in the nucleus and enter the free space of the cell.

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Full Answer

Once the two subunits are in the cytoplasm, they may bind together and attach themselves to the nuclear envelope or endoplasmic reticulum, or they may float freely. However, if protein synthesis is not occurring, Florida State University contends that the two subunits separate themselves. The rRNA rather than the ribosomal proteins primarily determine the structure of the ribosome, even though they account for about 40 percent of the ribosome’s mass.

Ribosomes are small organelles that manufacture proteins for use both inside and outside of the cell. They are much smaller than the other organelles that are found in the cell, and have to be small enough to pass through the nuclear pores, as explained by Florida State University. In contrast to most other organelles, some ribosomes float freely through the cytoplasm of the cell. Such free-floating ribosomes generally produce proteins for use inside the cell, while bound ribosomes generally produce proteins for external use.

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