Online Biology Notes For Class 11 And Solutions – Unit 3 – Types Of Cell Different scientists proposed the definition of a cell in different ways like- Mathias Jacob Schleiden, a German botanist, (1804-1881) and Theodor Schwann, a German zoologist, (1810-1882), together postulated for the first time that the cell is the basic unit of structure and function in all life. G. Loewy and P. Siekevitz (1963) have defined a cell as a unit of biological activity delimited by a semipermeable membrane and capable of self-reproduction in a medium free of other living systems. Wilson and Morrison (1966) defined the cell as an integrated and continuously changing system. John Paul (1970) has defined the cell as the simplest integrated organization in living systems capable of independent survival. All the above definitions have to define viruses as neither an organism nor a cell, though it contains a core of nucleic acid (DNA/RNA as genetic material) which is enclosed in an external
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