Chapter 7 CELL STRUCTURE AND FUNCTION M. C. Alejandro Cruz

2 Mr. Cruz CIDEB CELL STRUCTURE AND FUNCTION 7-1 Life is Cellular The discovery of the cell The invention of the microscope

3 Mr. Cruz CIDEB CELL STRUCTURE AND FUNCTION 7-1 Life is Cellular

4 Mr. Cruz CIDEB CELL STRUCTURE AND FUNCTION 7-1 Life is Cellular

5 Mr. Cruz CIDEB CELL STRUCTURE AND FUNCTION 7-1 Life is Cellular Englishman Robert Hooke used an early compound microscope to look at a thin slice of cork Anton van Leewenhoek used a single lens microscope to observe pond water and other things Matthias Schleiden concludes That all plants are made up of cells Theodor Schwann concludes that all animals are made up of cells Scientists begin to use microscopes 1855 Rudolph Virchow New cells could be produced from the division of existing cells

6 Mr. Cruz CIDEB CELL STRUCTURE AND FUNCTION MAKE THIS WORLD A BETTER PLACE FOR YOU

7 Mr. Cruz CIDEB CELL STRUCTURE AND FUNCTION 7-1 Life is Cellular Cell theory: All living things are composed of cells Cells are the basic units of structure and function in living things New cells are produced from existing cells

8 Mr. Cruz CIDEB CELL STRUCTURE AND FUNCTION 7-1 Life is Cellular The study of structure and movement of living cells: Fluorescent labels Light microscopy Confocal light microscopy High resolution video technology

9 Mr. Cruz CIDEB CELL STRUCTURE AND FUNCTION 7-1 Life is Cellular TEM: Transmission electron microscope Explore cell structure and proteins Beams of electrons pass through thin samples Sample must be cut ultrathin SEM: Scanning electron microscope Beams of electrons scan the surface Produces three dimensional images

10 Mr. Cruz CIDEB 7-1 Life is Cellular

11 Mr. Cruz CIDEB 7-1 Life is Cellular

12 Mr. Cruz CIDEB 7-1 Life is Cellular

13 Mr. Cruz CIDEB CELL STRUCTURE AND FUNCTION 7-1 Life is Cellular Cell range 5-50 micrometers Two characteristics: Surrounded by a barrier (CM) Contain DNA

14 Mr. Cruz CIDEB CELL STRUCTURE AND FUNCTION 7-1 Life is Cellular ProkaryotesEukaryotes Do not contain nulcei Contain nuclei Means “before” Means “true” Smaller and simpler Larger and more complex bacteria Plants, animals, fungi, protists

15 Mr. Cruz CIDEB CELL STRUCTURE AND FUNCTION 7-1 Life is Cellular Prokaryotes Eukaryotes

16 Mr. Cruz CIDEB CELL STRUCTURE AND FUNCTION CHAPTER THE END Mr. Cruz