1. 30 Seconds 10 Time’s Up! 3 Minutes 1 Minute 4 Minutes 2 1 5 2 Minutes
Bellringer 10/15
Reminders: HW #6 on Fri and Lab Fee NOW!
30 Seconds 10
Time’s Up!
3 Minutes
1 Minute
4 Minutes 2 1 5
2 Minutes 9 8 7 6 3 4

2. Cells

3. Smallest unit that performs life functions.
What are cells?
Smallest unit that performs life functions.

4. Discovery of Cells
1665- English Scientist, Robert Hooke, discovered cells while looking at a thin slice of cork (bark of tree)

5. The invention of the microscope
1673- Anton von Leuwenhoek, invented the microscope and observed pond scum and discovered single celled organisms

6. Where do cells come from?
1858- Rudolf Virchow, concluded that cells must come from preexisting cells.
Biogenesis – Life can only be formed from existing life.

7. The Compound Light Microscope
Lenses
Light
Up to x1500
bigger

8. Our Microscope…

9. The Cell Theory 1. All organisms are composed of 1 or more cells.
2. Cell is the smallest working unit of living things.
3. All cells come from pre-existing cells through cell division.

10. Basic Parts of a Cell 1. Nucleus- contains DNA
2. Cytoplasm –like the egg white of an egg
3. Plasma membrane – like the shell of egg
4. Organelles- small structures in the cytoplasm

12. Examples of Cells
Amoeba
Plants
Bacteria
Red Blood Cell
Nerve Cell

13. Two Types of Cells
A. Prokaryotic
B. Eukaryotic
REMEMBER US

14. A. Prokaryotic Cells
Do not have a membrane-bound nucleus or organelles
Few organelles
Usually one-celled -bacterias

15. B. Eukaryotic Cells
They do contain a membrane-bound nucleus and organelles and are more complex.
May be unicellular or multicellular
2. Animal
1. Plant

16. “Typical” Animal Cell

17. “Typical” Plant Cell

18. BELLRINGER 10/22
Match! Answers only! 5 Minutes! USE YOUR NOTES/BOOK!

19. Cell Membrane (Animal and Plant)
Outer membrane boundary of cell that controls movement in and out of the cell
Double layer with pores (holes)

20. Cell Wall (Plant) Most commonly found in plant cells & bacteria
Supports & protects cells
Rigid (tough), outside the cell membrane
Contains cellulose

21. Nucleus (Plant and Animal)
Directs cell activities- the brain of the cell
Separated from cytoplasm by nuclear membrane (envelope)
Contains chromatin (DNA)

22. Endoplasmic Reticulum (Animal and Plant)
Highly folded membrane that produces, transports proteins
Smooth type: lacks ribosomes
Rough type: ribosomes embedded in surface

23. Ribosomes (Plant and Animal)
Each cell contains thousands
Make proteins
Found on ribosomes, nuclear envelope & floating throughout the cell

24. Mitochondria (Plant and Animal)
Produces energy (ATP) through chemical reactions
Highly folded membranes
Has its own DNA

25. Golgi Apparatus (Plant and Animal)
Protein 'packaging plant'
Move materials within the cell
Move materials out of the cell
Flat tube system

26. Lysosomes (Animal)
Digestive factory and breaks down waste (proteins, fats, and carbohydrates) with enzymes
Transports undigested material to cell membrane for removal
Cell breaks down if lysosome explodes

27. Vacuoles (Plant and Animal)
Membrane-bound sacs for storage, digestion, and waste removal
Contains water
Help plants maintain shape
Many small in animal, 1 big one in plant cells

28. Chloroplast (Plant) Found in plant cells
Contains chlorophyll (gives color green to plants)
Where photosynthesis takes place (plants make own food from light energy)

29. Centrioles (Animal) Only in animal cells
Play role in cell division (mitosis)
Organize microtubules in bundles
Make up the centrosome (near the nucleus)

30. Cillia and Flagella (Animal and Prokaryotes)
Mostly in unicellular organisms (animal only) and bacteria
For movement and fluid transport
Cilia = many little hairs on the cell body
Flagella = few/one tail(s)

31. Cytoskeleton (Plant and Animal)
Network of rods (microtubule) and filaments (microfilaments)
Gives cell support, structure and shape
Involved in cell division (mitosis) and transport