Cell Structure and Function — Key Discoveries

Key Discoveries

Discovery of Cell (Robert Hooke)

1665

Robert Hooke observed thin slices of cork under a primitive microscope and noticed tiny, box-like compartments, which he named 'cells' due to their resemblance to the small rooms…

Formulation of Cell Theory (Schleiden & Schwann)

1838-1839

Matthias Schleiden (botanist) proposed that all plant tissues are composed of cells, and Theodor Schwann (zoologist) extended this to animal tissues, concluding that all living…

Omnis cellula e cellula (Rudolf Virchow)

1855

Rudolf Virchow added the crucial third tenet to the Cell Theory: 'Omnis cellula e cellula' (all cells arise from pre-existing cells). This refuted the idea of spontaneous…

Endosymbiotic Theory (Lynn Margulis)

1967 (modern synthesis)

While earlier proposed, Lynn Margulis provided compelling evidence for the Endosymbiotic Theory, which suggests that mitochondria and chloroplasts originated from free-living…