The wide variety of shapes is determined by the bacterial cell wall and cytoskeleton, and is important because it can influence the ability of bacteria to acquire nutrients, attach to surfaces, swim through liquids and escape predators. ... Motility: Motility imposes a heavy selective pressure on cell shape.
The bigger the shape the bigger the cytoplasm. The more the space for chemical rection to take place. The bigger the size the longer the psudepods (false feet).
