Answer
The cell cycle must be carefully regulated because each cell in a multicellular organism must grow and divide to a certain point and then stop. Then cell-programmed death or apoptosis must occur because, after a while, a cell is too damaged to continue and must die. On the other hand, when cells do not stop growing and dividing, diseases such as cancer occur.
Work Step by Step
The cell cycle must be carefully regulated because each cell in a multicellular organism must grow and divide to a certain point and then stop. Then cell-programmed death or apoptosis must occur because, after a while, a cell is too damaged to continue or has lost its usefulness and must die. On the other hand, when cells do not stop growing and dividing, diseases such as cancer occur.
