Region between nucleus and cell membrane . A large region of each cell enclosed by the cell membrane. This region takes up very little stain. It is called the cytoplasm.
The cytoplasm is the fluid content inside the plasma membrane. It also contains many specialised cell organelles. Each of these organelles performs a specific function for the cell.
Cell organelles are enclosed by membranes. In prokaryotes, beside the absence of a defined nuclear region, the membrane-bound cell organelles are also absent. On the other hand, the eukaryotic cells have nuclear membrane as well as membrane-enclosed organelles.
The significance of membranes can be illustrated with the example of viruses.
Viruses lack any membranes and hence do not show characteristics of life until they enter a living body and use its cell machinery to multiply
