1 Review What is a cell Explain What three statements make up the cell theory Infer How did the invention of the microscope help the development of the cell theory 2 Review How do microscopes work Apply Concepts What does it mean if a micrograph is “false-colored”
Ch 7 Cell Structure and Function 7.1 Life is Cellular
Robert Hooke 1665 used microscopes Looked in cork Used the word “cell.”
Anton van Leeuwenhoek Early master lens maker Made early microscopes Looked at pond water.
Cell Theory The cell is the basic unit of life All living things are made up of at least one cell All cells come from other cells.
Compound Light Microscope Light waves pass through small organisms or thin slices of larger ones Up to 1500 times magnification Ours magnify 400 times Used to see bacteria cells, and a few organelles.
Stains and Dyes Increases contrast and detail Can see more organelles.
Transmission Electron Microscope (TEM) Magnifies up to 1 million times Shows internal structures Specimen has to be dead.
Scanning Electron Microscope (SEM) Magnifies up to 1 million times Shows the surface of the specimen Used for cell surfaces, organelle membranes, viruses Specimen may be living.
Cell Types Eukaryote Prokaryote
Prokaryotes Lack nucleus Lack membrane bound organelles Bacteria.
Eukaryotes Have a nucleus Have membrane bound organelles Everything but bacteria.
Nucleus Contains the DNA Control center of cell.
Cell Membrane Plasma Membrane Controls what goes in and out of cell Protective boundary Semi fluid Similar to skin.