No they do not
The cell is the basic unit of structure of an organism.
is a cell
The cell nucleus is the structure that contains most of an organism's DNA.
The scientist should use an electron microscope
nucleus
cell wall and central vacuole
No. A protozoan is a one celled organism.
Cell
circulatory system
With a microscope
The scientist who discovered this type of organism, actually thought that it looked like a jail cell, because the scientist who discovered it saw a plant cell which is rectangular .
within its internal structure.