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Thinking Scientifically
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  1. After DNA is duplicated it must be bound to histone proteins. This requires the synthesis of hundreds of millions of new protein molecules, a process that the cell most likely regulates. With reference to Figure 9.1b, when in the cell cycle would histones be made? At what point might histone synthesis be switched on and off?
  2. When animal cells are grown in dishes in the laboratory most divide a few dozen times and then die. It would seem likely then that the cell cycle is not functioning properly. With the help of Figure 9.1b, hypothesize what could be wrong with the regulation of the cell cycle to turn it off.

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