7.1 notes over Cells

 Hooke-created the name “cell” when he looked at cork under the microscope  Van Leewonhoek-looked at pond water and discovered life  Schwann-Animals are made of cells  Schleiden-Plants are made of cells  Virchow-New cells come from existing cells People/Scientists

 1. All living things are made of cells.  2. Cells are the basic units of structure and function.  3. New cells come from existing cells. Cell Theory

 More powerful than light microscope  Use electrons to magnify 1000s  TEM-Transmission electron microscope  look at structures and large proteins  Must have thin slices  Items not alive  SEM-scanning electron microscope  Scan the surface of items  No cutting/not alive  3D images Electron Microscopes

 Use a probe-trace surface of samples  See a single atom  See DNA!  Live specimens used Scanning Probe Microscope

 Has a nucleus  Example: plants and animals; everything but bacteria Eukaryote All cells have two items: cell membrane and genetic material

 No nucleus for genetic material  Example bacteria Prokaryote