1. BELL WORK!
Name one difference between a prokaryotic and a Eukaryotic Cell?
Class Answer:
Prokaryotic – no nucleus, no membrane bound organelles.
Eukaryotic – Have a Nucleus and organelles

2. Learning Goal
Understand Cell Structures and functions

3. Chapter 7.1, 7.2 Notes
Take out paper to take notes.

4. Cell Discovery and Theory
Section 7.1

5. Cell Theory- 3 main ideas
All organisms are composed of one or more cells
The cell is the basic unit of organization of organisms
All cells come from preexisting cells.

6. Microscope Technology
Compound Light Microscope ~1000X
Has a series of lenses and uses visible light to magnify an image
Electron Microscope ~ 500,000X
TEM: transmission electron microscope
SEM: scanning electron microscope

7. Cell Diversity Cells vary in shape, which relates to their function
Skin cells are flat to cover the body
Nerve cells are branched to transmit impulses
Cell size is limited by the surface area-to-volume ratio

8. Section 7.1 Summary – pages 171-174
Two Basic Cell Types
Prokaryotic cells : cells that do not contain internal membrane-bound structures
Examples: Bacteria and some other single celled organisms
Section 7.1 Summary – pages

9. Prokaryotic cells
Basic structure

10. Section 7.1 Summary – pages 171-174
Two Basic Cell Types
Eukaryotic cells: contain membrane-bound structures .
Examples: all plant and animal cells
Section 7.1 Summary – pages

11. Eukaryotic cells

12. Eukaryotic v. Prokaryotic

13. Section 7.1 Summary – pages 171-174
Basic Parts of a Cell
Plasma membrane – Cell’s outer boundary
Organelles- membrane-bound structures within eukaryotic cells.
Cytoplasm-The fluid within the cell
Nucleus-The central membrane-bound organelle in eukaryotes.
Section 7.1 Summary – pages

14. The Plasma Membrane
Section 7.2

15. Purpose: To act as a barrier between a cell and its environment
To maintain homeostasis in a cell (a balance of conditions suitable for life)

16. Selective permeability
The plasma membrane is selectively permeable, so it allows certain substances (like oxygen and nutrients) in, while getting rid of others (like waste.)

17. Summary Section 2 – pages 175-178
Plasma Membrane
Oxygen
Amino acids
Water
Glucose
Wastes
Wastes
Carbon dioxide
SELECTIVE PERMEABILITY
Summary Section 2 – pages

18. Membrane structure It’s composed of a phospholipid bilayer
Polar heads (phosphate) on the outside
hydrophilic
Nonpolar tails (fatty acids) on the inside
hydrophobic
Two layers of phospholipids back-to-back

19. Polar heads: face outward and stay in contact with water inside and outside of cell
Nonpolar tails: point inward toward one another.

20. Fluid Mosaic Model
the phospholipids and proteins move within the membrane.
It is flexible

21. What does that mean?
“Fluid” means it can move
“Mosaic”

22. What are the other parts of the p.m.?
Cholesterol keeps the fatty acid tails from sticking together, keeps the membrane stable.
Carbohydrates stick out from the cell surface to help cells identify chemical signals.

23. Membrane Proteins Channel protein – always open
Transport proteins allow things to move through the plasma membrane
Channel protein – always open
Carrier protein – only open to certain substances

24. Membrane Proteins