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Nucleolus

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A cell is the basic unit of living organisms (both plants and animals) that is capable of reproducing itself exactly. That is, there are components within cells (organelles), but they do not reproduce themselves independently of the cell(s) of which they are a part.

The nucleolus is a dense spherical structure within the nucleus of a cell. It contains ribonucleic acid (RNA) for the synthesis of ribosomes and also has an important role in the production of proteins and RNA.
The nucleolus is a part of the nucleus of the cell that disappears during cell division.

See the Revision page about Cell Structure for further information including a diagram of the structure of a basic cell including the nucleus, nucleolus, etc..


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