Answer:
There are basically three types of cell shapes: coccus (spherical), bacillus (rod or cylindrical shaped), and spiral (twisted). Cell size is limited by a cell's surface area to volume ratio. The Shape of a cell determines the function of the cell.
Cells having spherical shapes are best and most advantageous because they have the smallest size that increases the surface-to-volume ratio. The cells with spherical shape experience greater frictional resistance.
Cells having a cylinder or rod-shaped helped the cell to concentrate molecules at specific cellular locales. Cylindrical cells are able to concentrate proteins at different locations in the cell.
