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The Nucleus:
The nucleus has a spherical shape. It is the cell's control center that oversees the functioning of the cell and, ultimately, determines the cells characteristics. Two components are the nuclear envelope and the nucleolus.
Nuclear Envelope: Another component of the nucleus, the nuclear envelope surrounds the nucleus by a double membrame, made up of two phospolipid bilayers. There are nuclear pores (or holes) in the envelope to provide passageway for materials to leave and enter the nucleus. The nuclear envelope covers the entire surface of the nucleus; therefore, it has a spherical shape.
The nuclear envelope acts as a shield for the nucleus. Without the nuclear envelope, there would be no separation between the nucleus and the cytoplasm.
The Nucleolus: Another component of the nucleus is the nucleolus. The nucleolus is the site where DNA is concentrated when it is in the process of making ribosmal RNA. The nucleolus is the densest part of the nucleus; it has a spherical shape. The nucleolus is only visible when the cell is not dividing.
Now that we know what the function of the nucleus is, how does it work? 1) The nucleus directs cell reproduction (cell divides into two new cells) 2) The nucleus controls the development of specialized cells 3) The nucleus directs metabolic activities of the cell.
The function of the nucleolus is to produce ribosomal RNA. Without ribosomal RNA, (made of protein/RNA) protein synthesis wouldn’t occur.
