Which is associated with G2M transition in cell cycle
**Core Concept**
The cell cycle is a highly regulated process consisting of several phases, including G1, S, G2, and M. The G2 phase is a critical period of cell cycle progression, preparing the cell for mitosis.
**Why the Correct Answer is Right**
The correct answer is associated with the G2/M transition, a checkpoint that ensures a cell is ready to enter mitosis. This transition is regulated by specific **cyclin-dependent kinases (CDKs)** and **cyclins**, particularly the M-CDK complex.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it is not directly associated with the G2/M transition.
**Option B:** Incorrect as it is involved in a different phase of the cell cycle.
**Option C:** Incorrect because it does not play a role in the G2/M transition.
**Option D:** Incorrect, although related to cell cycle regulation, it is not specifically linked to the G2/M transition.
**Clinical Pearl / High-Yield Fact**
A key regulator of the G2/M transition is the **p34cdc2** kinase, which is activated by **cyclin B**.
**Correct Answer:** D. Cdc25C