1. Cells are the Basic unit of life.

2. The cell theory grew out of the work of many scientists and improvements in the microscope. Many scientists contributed to the cell theory. Hooke: used a microscope to examine pieces of cork -Saw tiny structures looked like the rooms monks lived in called “cells” Leeuwenhoek: made improvements to the microscope. - First to observe living cells Schleiden: botanist, studied plants -all plants are made of cells Schwann: zoologist, studied how animals function - the cell is the most basic unit of animal structure. Virchow: Virologist, studied diseases -All cells come from preexisting cells

3. Early studies led to the development of the cell theory. The Cell theory has three principles. –All organisms are made of cells.

4. Early studies led to the development of the cell theory. The Cell theory has three principles. –All organisms are made of cells. –All existing cells are produced by other living cells.

5. Early studies led to the development of the cell theory. The Cell theory has three principles. – –All organisms are made of cells. – –All existing cells are produced by other living cells. – –The cell is the most basic unit of life.

6. PROKARYOTES (Prokaryotic Cells) Prokaryotes are organisms without a cell nucleus, or indeed any other membrane-bound organelles, and are unicellular Examples: Bacteria!!!!! Archaebacteria and Eubacteria Eubacteria Shape: coccus (circular), bacillus (rod-shaped), spirillum/spirochete/vibrio (spirals) Arrangement: Strep (chains), Staph (clumped) Borrelia Burgdorferi

7. Eukaryotes (Eukaryotic Cells) A single-celled or multicellular organism whose cells contain a distinct membrane-bound nucleus and membrane bound organelles. Examples: Plant Cells, Animal Cells, Fungal Cells, and Protists

8. Prokaryotic cells lack a nucleus and most internal structures of eukaryotic cells. All cells share certain characteristics.

9. Prokaryotic cells lack a nucleus and most internal structures of eukaryotic cells. All cells share certain characteristics. – –Cells tend to be microscopic. Bacterium (colored SEM; magnification 8800x)

10. Prokaryotic cells lack a nucleus and most internal structures of eukaryotic cells. All cells share certain characteristics. – –Cells tend to be microscopic. – –All cells are enclosed by a membrane. Bacterium (colored SEM; magnification 8800x) cell membrane

11. Prokaryotic cells lack a nucleus and most internal structures of eukaryotic cells. All cells share certain characteristics. – –Cells tend to be microscopic. – –All cells are enclosed by a membrane. – –All cells are filled with cytoplasm. Bacterium (colored SEM; magnification 8800x) cell membrane cytoplasm

12. There are two cell types: eukaryotic cells and prokaryotic cells.

13. Eukaryotic cells have a nucleus. nucleus cell membrane

14. There are two cell types: eukaryotic cells and prokaryotic cells. Eukaryotic cells have a nucleus. Eukaryotic cells have membrane- bound organelles. nucleus cell membrane organelles

15. There are two cell types: eukaryotic cells and prokaryotic cells. Prokaryotic cells do not have a nucleus. nucleus cell membrane organelles

16. There are two cell types: eukaryotic cells and prokaryotic cells. Prokaryotic cells do not have a nucleus. Prokaryotic cells do not have membrane-bound organelles. nucleus cell membrane organelles cytoplasm

17. Virus are NOT living because they can not reproduce without a host cell. They do not have Enzymes for metabolism Do not have ribosomes Do not have the equipment to make proteins They consist of nucleic acids enclosed in a protein coat and sometimes a membranous envelop. VIRUS