Q:

What happens in the nucleolus?

A:

Quick Answer

The nucleolus is chiefly responsible for creating ribosomes, which in turn function as factories for protein synthesis. The nucleolus contains three main organizing regions where transcription and processing of rRNA occurs. It also purportedly aids in other processes, like the packaging of signal recognition particles and the alteration of transfer RNA. The nucleolus is located in the nucleus, and thus only exists in eukaryotic cells.

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Full Answer

According to the Wiley Online Library, the first step in the process of ribosome formation is transcription. Here, ribosomal and nonribosomal proteins attach to and modify rRNA genes, which are located in a region known as the fibrillar center. Only more advanced eukaryotic cells possess a fibrillar center. Transcription of the rRNA occurs just between the fibrillar center and another region called the dense fibrillar component. Processing of the rRNA begins in the dense fibrillar component, and the procedure is finished in the granular component. This is where the rRNA is finally assembled with proteins to create units of pre-ribosomal material. At this point, the units are ejected into the cytoplasm of the cell.

The size of a nucleolus can vary greatly, depending on the type of cell it is found in. If a cell must make a large amount of protein, for example, it will require more ribosomes and thus necessitate a larger nucleolus to produce those ribosomes.

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Related Questions

  • Q:

    Do prokaryotes have ribosomes?

    A:

    Prokaryotic cells contain ribosomes to handle their protein production. The ribosomes in prokaryotic cells, such as bacteria, are free floating in the cytosol of the cell rather than bound inside a nuclear membrane; this is because prokaryotic cells do not have a nucleus.

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  • Q:

    What does the nucleus do in a plant cell?

    A:

    The function of the nucleus in the plant cell is to store the plant's DNA and control the activity of the cell through protein synthesis. The nucleus is enclosed by the nuclear membrane, which has pores for the passage of RNA and proteins. The nucleus contains the nucleolus and chromatin.

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    What are the three organelles involved in protein synthesis?

    A:

    There are four organelles that are involved in protein synthesis. These include the nucleus, ribosomes, the rough endoplasmic reticulum and the Golgi apparatus, or the Golgi complex. All four work together to synthesize, package and process proteins.

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  • Q:

    Where in the cell does protein synthesis take place?

    A:

    In a eukaryotic cell, the final stage of protein synthesis takes place in the cytoplasm after the initial stage, which happens in the nucleus. In a prokaryotic cell, there is no need for the second stage of the process.

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