Question

How does S-Cdk help guarantee that replication occurs only once during each cell cycle?

A) It blocks the rise of Cdc6 concentrations early in GI.
B) It phosphorylates and inactivates DNA helicase.
C) It phosphorylates the Cdc6 protein, marking it for destruction.
D) It promotes the assembly of a prereplicative complex.

Answer 1

The S-Cdk helps guarantee that replication occurs only once during each cell cycle by promoting the assembly of a prereplicative complex.

Step-by-step explanation:

The S-Cdk (S-phase cyclin-dependent kinase) helps guarantee that replication occurs only once during each cell cycle by promoting the assembly of a prereplicative complex.

The S-Cdk complex phosphorylates proteins involved in DNA replication, allowing them to initiate the formation of the replication machinery. This ensures that DNA replication starts only once per cell cycle.