The cell would no longer carry on diffusion. The cell would increase its oxygen requirement. The rate of photosynthesis in the cell would increase. The metabolic activity of the cell would cease. Cells are the units of structure in living things.
All cells are genetically identical.
All cells arise from preexisting cells. Cells are the units of function in living things. It has a body wall consisting of two cell layers. It has blood containing hemoglobin. It has a nerve net between its cell layers.