In which phase is cellular DNA duplicated?

Cellular DNA duplication occurs during the Synthesis (S) Phase of the cell cycle. This phase is a crucial part of the interphase, where the cell prepares for division. During the S Phase, each chromosome is replicated, resulting in two identical sets of chromosomes, which are essential for ensuring that each daughter cell receives an exact copy of the genetic material during mitosis. This process is vital for cellular reproduction and growth, as it allows for the correct distribution of genetic material when the cell divides.

In contrast, other phases mentioned do not involve DNA replication. The Resting phase (usually considered the G0 phase) is a state where cells are not actively preparing to divide. The Palliation phase typically refers to a stage in treatment rather than a part of the cell cycle, while the Postmitotic phase follows mitosis and involves the cells in a differentiated state, where they are not preparing to duplicate their DNA for the next cell cycle. Understanding the specific roles of each phase of the cell cycle helps clarify the mechanisms behind cell division and the importance of the S Phase in maintaining genetic integrity.