1. Unit 3

2. Don’t write but listen for the answers to: Who started the study of cells? How long ago were cells discovered? Who invented the microscope? What theory did these scientists give rise to?

3. Robert Hooke, 1635-1703, English Chemist, Mathematician, Physicist, and Inventor

4. Matthais Schleiden (Plants) Theodor Schwann (Animals) Germany 1839: all organisms made of cells.

5. Rudolf Virchow (Germany 1858): all cells come from cells.

6. Anton van Leeuwenhoek, 1632-1723, Wine Assayer, Surveyor, Cloth Merchant, Minor Public Official, and Inventor 1st to see microscopic living things. Cells are the basic units of life.

7. Modern Cell theory a.Cells are basic unit of life. b.All organisms are made of cells. c.Cells come from cells.

9. Modern Cell theory a.Cells are basic unit of life. b.All organisms are made of cells. c.Cells come from cells.

10. Robert Hooke 1600s saw cells and named them cells because they looked like cells (rooms) in a monastery. Schleiden 1838 discovered all plants are made of cells. Schwann 1839 discovered all animals are made of cells Anton van Leeuwenhoek cells basic units of life Rudolf Virchow 1858 discovered all cells come from cells.

11. What are 2 tools that allow us to study cells? How are they different?

12. Light microscopes use 2 lenses to form a clear image. Due to diffraction of light waves they can only magnify objects about 1000 times(1millionth of a meter).

13. Electron Transmission Microscopes focus a beam of electrons allowing DNA or viruses to be visualized. Some can visualize structures 1 billionth of a meter in size. Organelles in a grain of pollen from tobacco plant appears flat

14. Electron Scanning Microscopes scan the surface of a specimen giving 3 dimensional images of the surface.

15. What are the 2 major categories of Cells.

16. Drawing of prokaryote eukaryote How can you tell a prokaryote from an Eukaryotic cell? One micron is 1/1000 of a millimeter

17. characteristicprokaryoteeukaryote size 1um=1millionth of a meter.1um-10um 10um-100um Nucleus noYes Specialized organelles surrounded by membranes noYes Cell membrane Yes Cytoplasm yesYes Number of cells 11 or more

18. DNA Is this cell Prokaryotic or Eukaryotic?

20. Artist rendition of A virus Electron scan of an HIV virus Viruses are Prokaryotic.

21. Cell Organization How is a cell divided into sections?

22. Organelle: specialized internal structures in the cytoplasm of cells that carry out specific functions. (Division of labor) Like tiny organs.

23. The cell membrane separates the inside of a cell from the outside.

24. Once you get in … Cells have 2 main zones 1. In the cytoplasm 2. In the nucleus

25. How can you tell a mitochondria from a chloroplast? Where is a cell membrane in comparison to a cell wall? What is different about smooth & rough ER?

26. Plants and animals have a lot of organelles in common. Animal cell Both plant and animal cells Animal cellsPlant cells Venn Diagram Cytoplasm: fluid and organelles located between the Cell membrane and the nucleus. Organelle: specialized internal structures in the cytoplasm of cells that carry out specific functions. (Division of labor) Like tiny organs.