A plant cell has a cell wall and a cell membrane. The cell wall is the tough outer-layer that holds the cells shape. The membrane is a layer that controls what enters the cell.
Animal cells only have a semipermeable cell membrane this both holds the cell together and controls the substances that enter the cell.
The Cell Wall
cell wall
cylindrical shape doesn't describe for the bacterial cell shapes
A microtubule is the structure that supports and shapes the cell.
Plant cells usually have a fixed shape while animal cells usually have an irregular shape. Plants do not have bones unlike animals and thus have a cellulose cell wall to cause the cell to have a fixed shape. Thus, cell shapes are different for each cell.
In an animal (and human) cell, the cell membrane gives it its shape. And in a plant cell, both a cell membrane and cell wall give it its shape and protects it
controls what get in and out of the cell and shapes the cell
Eating the food with all nutrients helps in replacement of protoplasm [cell].Thus the cell retains their shapes.
The Cell Wall
Their different shapes help them to perform their various functions (jobs)
cell membrane and cell wall
No, the Cytoskeleton does. The Cytoskeleton also provides cellular stability and controls cell movement (Flagella, etc). The Cytoskeleton is connected in each cell to the next cell, through Gap and Tight junctions.
cell wall
In an animal the structure and support of the being doesn't depend on the strength of each cell but in a plant cell the structure depends on the strength and rigidity of the cell. Therefore, the plant cell has the regular shapes.
cylindrical shape doesn't describe for the bacterial cell shapes
Round , rod and spiral .
Cells are different shapes and sizes because they have different functions. The functions dictate the shapes and sizes.