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Cell division - Cell division In cell division an important...

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C ell division In cell division an important consideration is to be able to make an exact copy of a cell. Both the genetic information and the cell contents must be copied (genetic continuity). If cells make up a larger organism they must also be “social” in the sense that rules must be set up and enforced as to when and how cells can divide. We talked about three properties that cells have that demonstrate these rules. Anchorage dependence – cells will not grow unless on a solid surface (like the ones set up by other cells Growth factor dependence – cells will not grow unless stimulated by factors (usually made by other cells nearby) Density dependent growth inhibition – cells will not grow in a crowd of other cells. Also, we talked about how these signals work (signal transduction). Cells receive signals from the outside and those signals are transduced and amplified inside. This is done through pathways. Cells also keep time in an organism. If you take a cell out of an organism and place it in culture, this molecular clock still will function. Cells clocks are set to a 24 hour day and are cyclic. Cells also keep track of how many times they divide. Most cells divide only a limited number of times before they die. This is referred to as the Hayflick limit.
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