Cell Structure and Function — Tech Evolutions

Entry	Year	Description	Impact
1	1665 (Hooke)	Initial observation and coining of the term 'cell' by Robert Hooke from cork tissue.	Established the concept of discrete units within living matter, paving the way for microscopic study and the eventual Cell Theory.
2	1838-1839 (Schleiden & Schwann)	Formulation of the first two tenets of Cell Theory: all organisms are composed of cells, and the cell is the basic unit of life.	Provided a unifying principle for all biology, shifting focus to the cellular level for understanding life processes.
3	1855 (Virchow)	Addition of the third tenet: 'Omnis cellula e cellula' (all cells arise from pre-existing cells).	Completed the modern Cell Theory, refuting spontaneous generation and establishing cellular continuity as the basis for growth and reproduction.
4	1960s (Margulis)	Modern synthesis and evidence for the Endosymbiotic Theory, explaining the origin of mitochondria and chloroplasts.	Revolutionized understanding of eukaryotic evolution, highlighting the role of symbiotic relationships in cellular complexity.
5	1972 (Singer & Nicolson)	Proposal of the Fluid Mosaic Model for cell membrane structure.	Provided a dynamic and accurate representation of the cell membrane, explaining its selective permeability and diverse functions.