1. Plasma/Cell Membrane
Cell Membrane: controls entry & exit of any material
Selectively permeable
Occurs in ALL
Types of cells

2. Cell Wall Function: support, protection, maintains shape
Occurs in: prokaryotic cells & eukaryotic plant cells

3. Cell Membrane: contains phospholipid bilayer
Location: all around cell
Structure: double layer of lipids & phosphates

4. Phospholipid Functions
regulates substance exchange
Communicates with other cells
Protects from environment

5. Cholesterol Location: between phospholipids, partway through layer
Function: makes bilayer
Stronger
More flexible

6. Carbohydrates
Location: attached to external surface of integral proteins
Function: hold adjoining cells together OR or act as sites where viruses or chemical messengers (hormones) can attach

7. Proteins Location: through entire layer
Function: transports larger substances across membrane

8. Cell Wall Location: outside cell, outside cell membrane
Structure: cellulose
Function: support, protection, maintains shape

9. Ex of organisms with cell wall
Bacterial prokaryote
Plants: tree cells
Plants: Elodea

10. Plasma Membrane Construction
Phospholipid:
polar head: pasta wheels
Nonpolar tails: red pipe cleaners
Proteins: 2 plastic toys
Cholesterol: 2 pieces of neon pink paper
Carbohydrates: straw