Cell Cycle - Research Article from Macmillan Science Library: Genetics

This encyclopedia article consists of approximately 6 pages of information about Cell Cycle.
This section contains 1,636 words
(approx. 6 pages at 300 words per page)
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Control of the Cycle

During the G1 and G2 phases, cells grow and make sure that conditions are proper for DNA replication and cell division. During the G1 phase, cells monitor their environment and determine if conditions, including the availability of nutrients, growth factors and hormones, justify DNA replication. The decision to initiate replication is made at a specific "checkpoint" in G1 called the "restriction point."

The processes of DNA replication and mitosis, and intervening events during the cell cycle, occur in a highly ordered and specific manner. A complex network of proteins ensures that these events occur at the proper times. Intracellular and extracellular signals block cell-cycle progression at checkpoints if certain events have not yet been completed. After the restriction point, the cell is committed to replicating its genome and dividing, completing one round of the cell cycle. If, prior to the restriction point, cells sense...

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This section contains 1,636 words
(approx. 6 pages at 300 words per page)
Buy the Cell Cycle Encyclopedia Article
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Macmillan Science Library: Genetics
Cell Cycle from Macmillan Science Library: Genetics. Copyright © 2001-2006 by Macmillan Reference USA, an imprint of the Gale Group. All rights reserved.
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