04 - Cell cycle- A cell reproduces itself by undergoing an...

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Unformatted text preview: Cell cycle- A cell reproduces itself by undergoing an orderly sequence of events in which it duplicates its content and then divides into two- A cycle of duplication and division G 1 , S, G 2 M (nuclear division) M (cytokinesis) Cell cycle Interphase- Includes G 1 , S and G 2 phases- Time for growth and doubling their mass - The amount of time of the cell spent on interphase varies widely- Some cells such as nerve cells do not complete the entire cell cycle and are permanently arrested (G phase)- G 1 , S, and G 2 of interphase have distinct patterns of biosynthesis Most of cells stay in G 1 Æ Synthesize proteins and organelles Æ Cell growth Cells destined to divide enter S phase Æ DNA replication After DNA replication, cells enter G 2 phase and prepares for cell division- Cells undergo mitosis followed by cytoplasmic division The two gap phases also provide time for cell to monitor the environment to see whether it is suitable before the cell commits itself to S phase and mitosis If external condition is not favorable 1. Cells delay progress through G 1 or G 2 phase; or 2. Some may even enter a specialized resting state (G ) before resuming proliferation How?...
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This note was uploaded on 03/12/2012 for the course BIOL 0126 taught by Professor Wux. during the Winter '11 term at HKU.

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04 - Cell cycle- A cell reproduces itself by undergoing an...

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