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Up-regulation is a process that occurs within a cell triggered by a signal (originating internal or external to the cell), which results in increased expression of one or more genes and as a result the protein(s) encoded by those genes.
Best Answer: There are 3 checkpoints during the cell cycle. The checkpoints involve regulating chemicals (protein kinases and cylins) and other factors which allow the cell cycle to continue or be suspended at a certain stage. If everything is ok, the cycle continues. If not, the cycle stops. When the cell loses control of the cell cycle (the checkpoints have failed), the answerer above me is absolutely correct - cancer occurs. The cell telephone cycle is G1 S G2 and mitosis. It dived the cell telephone into 2 sister cells to replace the died cells.