Biology 137

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The Cell Membrane
The Cell Membrane

• Biology 137
• Ms. Stanton

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Levels of Organization

• Organism living thing
• Organ System
• Organ
• Tissue
• Cell basic unit of life

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Function of the Cell Membrane

• Protects cell
• Allows materials in/out of the cell
• Acts as a boundary between cell and its
  environment

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(Cell Membrane) Made up ofThe Phospholipid
Bilayer
Phosphate
TWO
FAT
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One Phospholipid
Lipid Tails Hydrophobic
Phosphate Head - Hydrophilic
water
fearing
water
love
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Orientation of Bilayer
H2O outside
H2O inside
So.. Which is correct?
YES!!!!!!
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3
1
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Phospholipid Bilayer
Lets take another look at it..
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Phospholipid Bilayer
picture the bilayer going around the entire cell
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Transport Protein and Other Components

• Channel Protein
• spans entire width of bilayer
• Function allows certain materials in/out

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Channel Proteinin action
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Marker Protein

• Identification
• Carbohydrate Chain off Protein
• (Blood Typing)

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Receptor Protein

• Receives information

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Cholesterol

• Function stability
• prevents lipid tails from
  sticking
• together

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Fluid Mosaic Model

• Flexible Membrane
• Phospholipids move around always changing

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