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Structure of Cells The cell theory forms a basis way for the way that biologists may now study living things. The cell theory states that all living things are made up of cells, cells are the smallest units of all living things, and all cells come from preexisting cells through cell division. The cell theory is an extremely popular method for biologists to observe organisms with. The cell theory applies to every single organism in …

…are distinguishable under a microscope. They are very small and they feature three main shapes: rod shaped, spherical, and spiral. Instead of going through an elaborate replication process like eukaryotes, bacterial cells divide by binary fission. There are also similiarities between the two types of cells. They both have DNA as their genetic material. Both are membrane bound and both have ribosomes. They have similar basic metabolism and they are both amazingly diverse in forms.