Essay On Prokaryotic And Eukaryotic Cells

1645 Words 7 Pages
I. The most basic unit of life is the cell. All living things are composed of cells. Cells may only from through a process of division and replication of previously existing cells. Cells are microscopic; however their structure is complex. All types of cells possess a plasma membrane which separates its contents from its surroundings. . There are two types of cells: prokaryotic and eukaryotic.
a. Prokaryotic cells are simpler than eukaryotic cells. Within prokaryotic cells are bacteria cells and archaea. All prokaryotic organisms are surrounded by a plasma membrane. However, some cells may contain either a cell wall or a capsule in addition to the plasma membrane. This determines the size, shape, and provides structure for the cell. Unlike eukaryotic cells, they do not contain any
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The nucleus serves as the control center of the cell. It is responsible for directing the cell in its functions and it also stores the DNA. It is made up of three main parts: the nuclear membrane, the nucleolus, and the genetic material also known as DNA. The nuclear membrane is made up from the nuclear envelope and nuclear pores. Like the plasma membrane, the nuclear membrane separates the nucleus from the other organelles and contents of the cell. The nuclear membrane is made up of the nuclear envelope and nuclear pores. The nuclear envelope is a two layer membrane that separates the nucleus from the cytoplasm and other organelles. However, molecules must have a way to enter the nucleus. This is why the nuclear envelope forms nuclear pores. These are small openings embedded with ribosomes and proteins that allow other molecules to enter. The DNA located in the nucleus is formed into structures called chromosomes, as opposed to the circular DNA in prokaryotic cells. This structure allows it to go through the process of meiosis. Also located in the nucleus is the nucleolus. Inside the nucleolus are ribosomes. They are responsible for making the proteins necessary to the

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