2. Chapter 7 Cellular Structure and Function
Section 1: Cell Discovery and Theory
Section 2: The Plasma Membrane
Section 3: Structures and Organelles
Section 4: Cellular Transport

3. All organisms are composed of one or more cells.
Chapter 7
Cellular Structure and Function
7.1 Cell Discovery and Theory
The Cell Theory
All organisms are composed of one or more cells.
The cell is the basic unit of structure and organization of organisms.
All cells come from preexisting cells.

4. Magnifies images up to 1,000 times the actual size
Chapter 7
Cellular Structure and Function
7.1 Cell Discovery and Theory
Light Microscopes
Utilizes a series of glass lenses and visible light to magnify an image
Magnifies images up to 1,000 times the actual size

5. Utilizes magnets to aim a beam of electrons at a cell to produce
Chapter 7
Cellular Structure and Function
7.1 Cell Discovery and Theory
Electron Microscopes
Utilizes magnets to aim a beam of electrons at
a cell to produce
an image
Magnifies images up to 500,000 times the actual size
9560x
Microscopy Links

6. Eukaryotic U-kary-otic Prokaryotic Pro-kary-otic
eu = (prefix) means TRUE
pro = (prefix) means BEFORE
kary = means NUCLEUS

7. So what does the word mean or stand for:
 Eukaryotic = __________________________
True Nucleus
Prokaryotic = __________________________
Before Nucleus

8. Contains a plasma membrane
Chapter 7
Cellular Structure and Function
7.1 Cell Discovery and Theory
Prokaryotic Cell
Simple structure
Contains a plasma membrane
Does not contain membrane-bound organelles
11,000x

9. More complex structure
Chapter 7
Cellular Structure and Function
7.1 Cell Discovery and Theory
Eukaryotic Cell
More complex structure
Contains a plasma membrane
Contains membrane-bound organelles
400x

10. Of the six words listed, pick three that you think best fit together.
Organelles  Nucleus
Eukaryotic  Prokaryotic
Plasma Membrane  Cell 
Write them down and explain why you think they belong together.
Share them with the person beside you and tell them why you choose them.
Explain why your partner choose the words (which ones)

11. Prokaryotic & Eukaryotic
Prokaryotic = cells without a nucleus or other membrane bound organelles. (bacteria or virus) - all need a host Eukaryotic = cells with a nucleus and other organelles that are bound by membranes. (human cells)

12. 7.2 Plasma Membrane
Selective Permeability ( pur - me - uh - BIH - luh - tee )
is a property that allows some substances to pass through a membrane while keeping others out.
Analogy = a similarity in some respects between things that are
otherwise dissimilar.
Like a fishing net, it allows water and some small fish through, but keeps the bigger fish from going through.

13. Have students write their own analogy for a cell's selective permeability.

14. Thin, flexible boundary between the cell and its environment
Chapter 7
Cellular Structure and Function
7.2 The Plasma Membrane
Plasma Membrane
Thin, flexible boundary between the cell and its environment
Allows nutrients into the cell
Allows waste to leave the cell

15. Selective Permeability
Chapter 7
Cellular Structure and Function
7.2 The Plasma Membrane
Selective Permeability
The plasma membrane controls the movement of
substances into
and out of the cell.
Plasma Membrane
Controls the amount of a substance entering the cell
Controls the amount of a substance leaving the cell

16. The plasma membrane is composed of the phospholipid bilayer.
Chapter 7
Cellular Structure and Function
7.2 The Plasma Membrane
The plasma membrane is composed of the phospholipid bilayer.
A phospholipid molecule is composed of a glycerol backbone, two fatty acid chains, and a phosphate group.

17. Chapter 7
Cellular Structure and Function
7.2 The Plasma Membrane
Fluid Mosaic Model
The phospholipid bilayer allows other molecules to “float” in the membrane.
Other Components
Proteins
Cholesterol
Carbohydrates

18. Transmit signals inside the cell Act as a support structure
Chapter 7
Cellular Structure and Function
7.2 The Plasma Membrane
Proteins
Transmit signals inside the cell
Act as a support structure
Provide pathways for substances to enter and leave

19. Prevents fatty acid tails from sticking together
Chapter 7
Cellular Structure and Function
7.2 The Plasma Membrane
Cholesterol
Prevents fatty acid tails from sticking together

20. Identify chemical signals
Chapter 7
Cellular Structure and Function
7.2 The Plasma Membrane
Carbohydrates
Identify chemical signals

21. Made of a Phospholipid bilayer ( Fhas - foh - LIH - pid )
Carbohydrates = acts as sensors (detects harmful
things on outside of cell.
Cholesterol = helps fatty acids from sticking
together
Proteins = (transports) - allow things in and out of
cell
Talk about Peanut Butter and ______________ sandwich.

22. Have students make a concept map, using the following terms.
Plasma membrane 
Non-polar
 Phospholipids
Bilayer 
Cholesterol
Polar 
Proteins