Final answer:
S-Cdk prevents re-replication by promoting the degradation of replication factors, ensuring that chromosomal DNA is replicated only once per cell cycle.
Step-by-step explanation:
S-Cdk helps prevent re-replication of chromosomal DNA. It does this by promoting degradation of replication factors rather than inhibiting DNA repair, blocking DNA polymerase activity, or enhancing helicase function.
Once replication factors are degraded, they are not available for initiating another round of replication until they are synthesized again, ensuring that each part of the genome is replicated only once per cell cycle. An important part of ensuring proper DNA replication and cell division is the accurate duplication of the chromosomal DNA only once per cell cycle to prevent mutations or cancer development.