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The nucleus controls and regulates the activities of the cell and carries the genes, structures that contain the hereditary information. Nucleoli are small bodies often seen within the nucleus.
The general purpose of the nucleus is to predetermine and control the production of proteins. It does this by storing the protein code in the DNA, which is hereditary.
The nucleus has 2 primary functions: It is responsible for storing the cell's hereditary material or the DNA. It is responsible for coordinating many of the important cellular activities such as protein synthesis, cell division, growth and a host of other important functions.
Nucleus is known as the brain of the cell because it regulates all the activities of the cell and contains genetic material . It passes the information from pre existing cell to new cell.