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The Cell Cycl1 - This regulation is not achieved through...

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The Cell Cycle Cell Cycle Regulation Note : This section goes into greater detail than is necessary for classes on the level of AP Biology. It does, however, provide further insight into the processes behind cell regulations that AP Biology glosses over. In this section, we will review the biological regulators of the cell cycle. Control of the cell cycle is necessary for a couple of reasons. First, if the cell cycle were not regulated, cells could constantly undergo cell division. While this may be beneficial to certain cells, on the whole constant reproduction without cause would be biologically wasteful. Second, internal regulation of the cell cycle is necessary to signal passage from one phase to the next at appropriate times.
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Unformatted text preview: This regulation is not achieved through strict time constraints, but rather with feedback from the cell. We already discussed some regulatory issues when we talked about cellular conditions necessary for passage from G1 and G2. Here, we will discuss more specifically the proteins that interact to regulate the cell cycle. The "checkpoints" that we described earlier are established by proteins that use cues from the cell's environment to trigger the entry to and exit from the distinct phases of the cell cycle. We will discuss two main families of proteins involved in this process—cyclin-dependent protein kinases (Cdks) and cyclins....
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