THE CELL CYCLE: HOW A CELL SURVIVES Introduction

All living organisms consist of cells, which divide and multiply. As noted by Campbell and Reece (2001), with the exception of bacteria and blue-green algae, all organisms are composed of eukaryotic cells, which have their genetic information in the chromosomes which is located in a nucleus separated from the rest of the cell, the cytoplasm. The cells live by increasing in size and making exact replicas of all of their genetic material.

The process of cell division (cell proliferation) is characterized by four distinct phases which have been discussed by Alberts, Johnson, Lewis, Raff, Roberts, and Walter (2002). The GI phase, according to Alberts et. al (2002), is the first phase of the cell cycle in which cells grow in size and are receptive to signals that are external to the cell itself. Such signals include soluble growth factors and intracellular contact. At some point, these signals can operate to trigger the cell to begin the second phase of the cycle.

During the G1 Phase, the cellÆs met

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Approximate Pages = 5 (250 words per page)

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