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Biology 2nd Baccalaureate

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1.2. Cell theory

Cell theory

Robert Hooke was the first person to describe, in 1665, a sheet of cork in which he observed a large number of cells that he called cells. Later, many scientists (Schwann and Schleiden, 1839, Virchow, 1885 and Santiago Ramón y Cajal,1906) have been contributing their knowledge until reaching the current concept of cell, which has led to the creation of the cell theory:
  • All living things are made up of one or more cells.
  • The cell is the anatomical and physiological unit of living beings. It is the smallest unit that has life.
  • All cells come from the division of a previous cell.
  • The cell contains hereditary material (DNA) in which the characteristics of the living being are found and that will be transmitted from a mother cell to its daughter cells.


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Biology and Geology teaching materials for Compulsory Secondary Education (ESO) and Baccalaureate students.