Final answer:
The cell cycle is controlled by checkpoints and regulator molecules that function like the sequential cycles of a washing machine, ensuring that each phase is completed before advancing to the next.
Step-by-step explanation:
The cell cycle control system is akin to a washing machine in that both are designed with checkpoints and processes that must be completed in sequence before moving to the next phase. A washing machine will not progress to the spin cycle until the wash cycle is complete, much like how cells will not proceed to mitosis until they have correctly completed the necessary preparations in interphase. This regulation ensures the proper functioning and health of both the machinery and the organism.
Within the cell cycle, a series of regulatory proteins function as checkpoints at various stages. Positive regulator molecules, including cyclins and cyclin-dependent kinases (Cdks), act as 'go' signals, allowing the cycle to advance. Conversely, negative regulator molecules act as 'stop' signals, monitoring conditions and pausing the cycle if requirements are not met. Only when all criteria are satisfied does the cell proceed, mirroring how a washing machine will only advance to the next cycle when all previous steps have been successfully complete.