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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.

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Presentation on theme: "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."— Presentation transcript:

1 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”

2 CH 7 CELL STRUCTURE AND FUNCTION 7.1 Life is Cellular

3 Robert Hooke  1665 used microscopes  Looked in cork  Used the word “cell.”

4 Anton van Leeuwenhoek  Early master lens maker  Made early microscopes  Looked at pond water.

5 Cell Theory 1. The cell is the basic unit of life 2. All living things are made up of at least one cell 3. All cells come from other cells.

6 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.

7 Stains and Dyes  Increases contrast and detail  Can see more organelles.

8 Transmission Electron Microscope (TEM)  Magnifies up to 1 million times  Shows internal structures  Specimen has to be dead.

9 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.

10 Cell Types  Eukaryote  Prokaryote

11 Prokaryotes  Lack nucleus  Lack membrane bound organelles  Bacteria.

12 Eukaryotes  Have a nucleus  Have membrane bound organelles  Everything but bacteria.

13

14 Nucleus  Contains the DNA  Control center of cell.

15 Cell Membrane Plasma Membrane  Controls what goes in and out of cell  Protective boundary  Semi fluid  Similar to skin.


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