Final answer:
Cyclin B is the cyclin responsible for pushing the cell into the G2 phase of the cell cycle. It works in conjunction with cyclin-dependent kinases to ensure proper cell cycle progression, preparation for mitosis, and to help prevent errors that could lead to uncontrolled cell division.option 2 is correct answer.
Step-by-step explanation:
The cell cycle is a complex process involving various stages of cell growth and division. Cyclins, in coordination with cyclin-dependent kinases (Cdks), play a pivotal role in transitioning the cell through the phases of the cell cycle. In the context of the cell cycle, the specific cyclin that is elevated to push the cell into the G2 phase is Cyclin B. Prior to the G2 phase, Cyclin A is involved in the S phase, aiding in DNA synthesis.
Cyclin D, on the other hand, is associated with the progression through the G1 phase, where cell growth occurs before entering the S phase. Cyclin E also contributes to the transition from G1 to S phase. During the G2 phase, the cell prepares for mitosis, and the concentration of Cyclin B increases to facilitate this transition.
After the cell has successfully moved into the mitotic phase, the levels of Cyclin B rapidly decline as it is degraded by cytoplasmic enzymes. This precise regulation ensures the cell cycle progresses in a controlled manner, preventing errors that could lead to problems such as cancer development.