Lecture 12 - 2 slides page

Table 18 1 essential cell biology todays topics 1

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Unformatted text preview: divided into four phases Figure 18-2 Essential Cell Biology 3 3/3/13 DuraEon of the cell cycle varies greatly from one cell type to another Bacteria 10- 20 minutes Most nerve cells never divide again. Table 18-1 Essential Cell Biology Today’s topics 1.  The cell cycle is divided into four phases. 2.  The ordering of cell cycle events is controlled by checkpoints. 3.  Cyclin- dependent kinases drive the cell cycle 4.  Cyclin- Cdk complexes are regulated by inhibitory and acHvaHng phosphorylaHons. 5.  Defects in checkpoints can cause cancer. 4 3/3/13 The ordering of events in the cell cycle is controlled by checkpoints What is a checkpoint? It is a mechanism that puts a brake on the cell cycle to ensure that one process is completed before the next one is started. Figure 18-3 Essential Cell Biology Today’s topics 1.  The cell cycle is divided into four phases. 2.  The ordering of cell cycle events is controlled by checkpoints. 3.  Cyclin- dependent kinases drive the cell cycle 4.  Cyclin- Cdk complexes are regulated by inhibitory and acHvaHng phosphorylaHons. 5.  Defects in checkpoints can cause cancer. 5 3/3/13 Protein kinase...
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