The dimorphic life cycle of C. crescentus is the result of an obligate asymmetric cell division that gives rise to a larger stalked cell and a smaller swarmer cell. The swarmer progeny is specialized for dispersal whereas the stalked cell helps in colonizing favorable substrates. Whereas the stalked cell is able to immediately re-initiate a new round of replication and cell division, the swarmer cell remains in a motile, replication inert phase (G1) before differentiating into a replication-competent stalked cell. Exit from G1 is controlled by environmental factors like nutrient availability, but also by regulatory systems, and Caulobacter cells use metabolic checkpoints to modulate cell cycle and development depending on nutrient availability. We investigate the molecular basis of these metabolic checkpoints, in particular those used to coordinate metabolism with cell division. We also study the molecular mechanisms determining the time spent in G1 phase as well as the factors triggering the G1-to-S transition.