7.1 Cell Discovery and Theory - Oak Park Independent€¦ · 7.1 Cell Discovery and Theory Cell...
Transcript of 7.1 Cell Discovery and Theory - Oak Park Independent€¦ · 7.1 Cell Discovery and Theory Cell...
7.1 Cell Discovery and Theory
Cell Discovery & TheorySection 7.1
1665 - Robert Hooke identified cells in cork and named them
Hooke 1683 - Anton van Leeuvenhoek 1st to describe living cells
1838 - Matthias Schleiden proposed plants were made of cells
1839 - Theodor Schwann concluded all living things are made of cells
1855 - Rudolf Virchow proposed all cells come from existing cells
Leeuvenhoek
Schleiden
Schwann
Virchow
Discovery of the Cell
Cell Theory1. all organisms are made of cells2. all existing cells are produced by other living cells3. the cell is the most basic unit of life
· vary in size and shape· tend to be microscopic· enclosed in a membrane· filled with cytoplasm
jellylike substance that contains dissolved molecular building blocks (proteins, nucleic acids, minerals, ions)· some cells have organelles
structures that perform a specific task in the cell
Cells in General
Prokaryotic Cells· NO nucleus· NO membrane-bound organelles· single-celled
· have a nucleus (houses genetic material - DNA)· have membrane-bound organelles· multicellular or single-celled
Eukaryotic Cells
7.1 Cell Discovery and Theory
Microscopes
· compound light microscopeuses lenses and light to magnify objectsmax magnification = 1000xocular (eyepiece) x lens = total magnificationoften uses stains to see cells better
· electron microscopetransmission electron microscope (TEM) uses
magnets to aim a beam of electrons through cells
max magnification = 500,000xspecimen must be dead, sliced very thin,
and stained with heavy metals