Protoplasm may appear completely structure less when it is observed under a microscope. But the animal cell is never without structure and its protoplasm is differentiated into various parts to form cell organs.
Even protoplasmic matrix in which granules and vacuoles are contained, is without any visible structure; and in some parts of cell, protoplasm may be without contained bodies of any kind. Optically, protoplasm is entirely homogeneous like pseudopodial protoplasm of Arcella or Difflugia