1. Lesson Overview Lesson Overview Cell Structure Biology What is needed for something to be biotic? – Cells – Genetic code – Grow, develop, reproduce – Respond – Homeostasis – Change over time Video – Jot down what the following people did? Video – Aton vanLeeuwenhoek – Robert Hooke – Schleiden – Schwann – Virchow – What are the 3 parts of cell theory?

2. Lesson Overview Lesson Overview Cell Structure Discovery of Cells Robert Hooke – 1665

3. Lesson Overview Lesson Overview Cell Structure Anton van Leeuwenhoek Schleiden and Schwann Rudolf Virchow - 1855 Cell theory – All living things – Basic units – Produced from existing cells

4. Lesson Overview Lesson Overview Cell Structure Types of Cells Similarities Prokaryotes – Bacteria – DNA is free – Smaller – Simpler Archaea – Prokaryote Slight differences – Extremophile Bacterial cell Animal cell

5. Lesson Overview Lesson Overview Cell Structure Eukaryotes Enclosed DNA Larger More complex Plants, animals, fungi…

6. Lesson Overview Lesson Overview Cell Structure Why are cells important? Bodies are made of cells Cells  Tissues  Organs  Bodies 3 main jobs Make energy Make proteins Make more cells Organelles Do the work

7. Lesson Overview Lesson Overview Cell Structure Observation of Cells Lab -Take a very thin slice of onion and observe under a microscope -Draw a diagram of what you see, try to get one cell -Label any known structures and the observation magnification -Take a small scraping of cheek cells and observe under a microscope -Draw a diagram of what you see, try to get one cell -Label any known structures and the observation magnification -Homework: Complete labeling assignment sent to you as a Google Form

8. Lesson Overview Lesson Overview Cell Structure Daily Review #1 1.What is the difference between prokaryotes, eukaryotes and archaea? 2.Why does an organism need cells? 3.What are the 3 parts of cell theory?

9. Lesson Overview Lesson Overview Cell Structure Cell (Plasma) Membrane Boundary Separate inside from outside Transport materials IN food - sugars - proteins - fats salts O 2 H 2 O OUT waste - ammonia - salts - CO 2 - H 2 O products - proteins

10. Lesson Overview Lesson Overview Cell Structure Make a Cell Membrane Need something to separate from water Phospholipids Head (phosphate) – hydrophilic Tails (lipids) – hydrophobic Bilayer Embedded proteins Fluid mosaic Exterior carbohydrate chains

11. Lesson Overview Lesson Overview Cell Structure Semi-Permeable Membrane inside cell outside cell lipid waste Control what gets in and out Protection Import nutrients Export products and waste Allows some material to get in and out Some things move freely Fats Oils Other things need “doors” Membrane proteins

12. Lesson Overview Lesson Overview Cell Structure Membrane (Channel) Proteins Go across the layers Proteins are specific Only allow certain molecules through Complex shapes

13. Lesson Overview Lesson Overview Cell Structure Diffusion Move from high to low concentration Trying to even things out Why molecules will move across the membrane through proteins Type of passive transport No energy used

14. Lesson Overview Lesson Overview Cell Structure

15. Lesson Overview Lesson Overview Cell Structure

16. Lesson Overview Lesson Overview Cell Structure Daily Review #2 4. Why is a cell membrane considered a a)Bilayer? b)Fluid mosaic? c)Semi-permeable? 5.Why do cells need cell membranes? 6.What will happen in the picture to the right and why?

17. Lesson Overview Lesson Overview Cell Structure

18. Lesson Overview Lesson Overview Cell Structure Active Transport Requires energy (ATP) Uses special membrane proteins (pumps) Moves against the concentration (uphill) Low to High Why? Need even more inside than there is Na and K

19. Lesson Overview Lesson Overview Cell Structure