University:
York University
Course:
SC/BIOL 2021 | Cell Biology
Academic year:

2023
Views:

130

Pages:

2
Author:

Nick T.

The Cell Theory: A Brief History Robert Hooke 1635-1703 Invented the first microscope Viewed slices of Cork "Cellula" (little rooms) Antonie Van Leeuwenhoek 1632-1723 Worked with glass and made big improvements with lenses Made nearly 300x magnification possible First to Observe Single Celled protists Bacteria from his mouth Blood Cells Sperm Progress with the microscope stalled for about a Century which limited resolving power and had emphasis on description rather than explanation. 1830s: Compound Microscope Improved magnification and resolution Allowed for visualizations of objects less than 1µm What can we see? ATOMS MOLECULES ORGANELLES CELLS *Note: Organelles can overlap with Cells Atoms can overlap with molecules 1m-10mm Robert Brown 1833 * Botanist * Discovered the nucleus in plant Cells when he noticed every plant Cell had a kernel-like round structure Matthieus Schleiden 1838 * Botanist * Discovered that all plant tissues are composed of Cells * Embryonic plant always arose from a single cell Theodor Schwann 1839 * Zoologist * Noticed through observation in animal cells that there are Structural Similarities in plant and animal Cells * Formulated the Cell Theory Cell Theory ** 1. All organisms consist of one or more cells 2. The Cell is the basic unit of structure for all organisms 3. All Cells arise only from pre-existing Cells * Schleiden is also credited for cell theory

The Cell Theory - A Beirf History Notes

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