Do Now• Turn in your plant & animal cell lab from

yesterday• Turn in your Prok. & Euk. Interactive• What type of cell is pictured below? • How do you know?

Plasma Membrane and Cell Wall

Fill in the chart at the top of your notes. Use your notes if

necessary.

Cell Membrane Functions:• forms a boundary between inside and outside

of the cell• controls passage of materials

Membrane: Prokaryotic Cell

Membrane: Eukaryotic Cell

Cell Wall • Provides Structure & Support

Cell Wall: Prokaryotic Cell

Cell Wall: Eukaryotic Cell

Phospholipid: Structure

Phosphate Head

Lipid Tail

Hydrophilic: LOVES water

Hydrophobic: HATES water

Cell Membrane Structure

• Read the instructions found with your fasteners.

• Use your fasteners to model the structure of a cell membrane

Phospholipid bilayer

Membrane is made up of two layers of phospholipids.

With this arrangement in mind, where is the “water” in the diagram?

WATER

WATER

Hydrophilic: LOVES water

Hydrophilic: LOVES water

Hydrophobic: HATES water

Location: Surrounds the cell and organelles

Function of PhospholipidsControls what comes in and out of cells;

the gatekeeper

Characteristics of Phospholipid Bilayer

• Fluid Mosaic Model: The cell membrane is flexible- Behaves like a fluid - like oil on water- Phospholipids can

• move from side to side• slide past each other

Characteristic of Phospholipid Bilayer

• Selectively Permeable (semipermeable)

Some molecules can cross the membrane while others cannot.

Characteristic of Phospholipid Bilayer

• Selectively Permeable (semipermeable)

Some molecules can cross the membrane while others cannot.

Cholesterol

Location: Found in

between the phospholipids in the bilayer.

Function:Keeps the membrane

together; the phosphate

heads are not attached to each

other

ProteinsLocation: Within the phospholipid bilayer

1. Transport ProteinsHelps larger substances pass through the

bilayer

2. Glycoprotein: Protein with a carbohydrate

Helps cells recognize similar cells; similar cells form tissue

Carbohydrate

Location: On the top of proteins or phospholipids

Function: Help recognized similar cells to form tissues OR to recognize foreign

substances in the cell

*

Cell WallLocation: Layer outside of the cell

membrane in some organismsFunction: Provide structure and support

Plants

Cell Wall

BacteriaCell Wall

Cell Wall

Fungus

Phytoplankton

Cell Wall