Describe how the Retinoblastoma (Rb) protein controls entry into S-phase What would happen if Rb was

Describe how the Retinoblastoma (Rb) protein controls entry into S-phase What would happen if Rb was mutated such that it could not be phosphorylated?
Describe how p53 controls cell cycle arrest after DNA damage
List the different enzymatic activities that the E coli RecBCD complex catalyzes and describe the significance of each activity in the steps of homologous recombination via the DSB repair pathway
During homologous recombination, the Holliday junctions produced must be resolved Discuss the proteins that accomplishes this process in E coli