For bio about cell
cell is usually made up of cytoplasm. cytoplasm is a jelly like substance. the plasma membrane is a semi permeable membrane. the cytoplasm or we can see the cell takes the shape of that of the plasma membrane. in plant cell the membrane is stiff hence there is a stiff shape but an animal cell is not of any definite shape...............
they all r not of same size or shape they differ silghtly
but they are in rectandular shape and the corners are not sharp