Post on 19-Jan-2018
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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