Progression through the phases of the cell cycle is regulated by fluctuating concentrations of ____.
A) microtubules
B) actin
C) cyclins
D) cyclin-dependent kinases
E) histones

Question

Quizplus · Accepted Answer

Cyclins are proteins whose concentrations vary throughout the cell cycle, and they regulate the progression through different phases by activating cyclin-dependent kinases.

Progression Through the Phases of the Cell Cycle Is Regulated