Final answer:
Cells do grow during mitotic S phase (synthesis phase of interphase) as they undergo DNA replication.
Step-by-step explanation:
During the S phase (synthesis phase) of interphase, cells undergo DNA replication, which means the cells do grow in size. The S phase is the period during which a cell replicates its DNA.
The S phase is followed by the G₂ phase (second gap), during which the cells replenish energy stores and synthesize proteins necessary for chromosome manipulation and movement. Some additional cell growth may occur during G₂, before the cell enters the first stage of mitosis.
Overall, the interphase of the cell cycle involves growth and protein synthesis, including DNA replication, which occurs during the S phase.