[Campbell Biology P.295] Based on Figure 12.16a, what is the correct relationship between cy... | Practice Question

Based on Figure 12.16a, what is the correct relationship between cyclin concentration and MPF activity during the cell cycle?

  • A: MPF activity peaks before cyclin concentration.
  • B: MPF activity peaks after cyclin concentration reaches its maximum.
  • C: Cyclin concentration remains constant, while MPF activity fluctuates.
  • D: MPF activity gradually decreases as cyclin concentration increases.

Explanation

Figure 12.16a illustrates that cyclin concentration rises and peaks, and only after sufficient cyclin has accumulated does MPF activity also peak. This sequential relationship is crucial for the proper progression of the cell cycle, as cyclin is a regulatory subunit of MPF.