Last Modified: 2011-12-04
Every cell has the potential to become any type of body cell
-Undefferentiated cells are called stem cells
The type of cell they will become is set and cannot be changed.
-Some sets of genes that will not be needed by this cell type are inactivated
-The primary regulatory mechanism in eukaryotes is the regulation of Transcription
-The "default" state for most genes is to be turned off
-Transcriptiong must be turned on by an activator protein when the gene is needed
Cells can receive messages from other parts of the body that can turn on and turn off the expression of certain genes
-Hormones are common messengers
produces embryonic stem cells
-Certain viruses can cause cancer
-often carry specific genes called Oncogenes
Cells can also acquire oncogenes by mutation of one of their own genes
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