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By switching genes off when they are not needed, cells can prevent resources from being wasted. There should be natural selection favoring the ability to switch genes on and off. Complex multicellular organisms are produced by cells that switch genes on and off during development. A typical human cell normally expresses about 3% to 5% of its genes at any given time. Cancer results from genes that do not turn off properly. Cancer cells have...
23 p pdu 20/10/2012 154 1
Từ khóa: Prokaryotes, Bacteria and Archaea, Control of Gene Expression, DNA, Cells, công nghệ sinh học, kiểm soát gene
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