Cell Membrane Notes

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Cell Membrane Notes
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Objective

• Describe the function of the cell membrane.

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Vocabulary

• Cell membrane
• Phospholipid
• Fluid mosaic model
• Selective permeability

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Cell Membrane

• Forms a boundary between a cell and the outside
  environment and controls the passage of materials
  into and out of the cell.

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Phospholipid

• A molecule composed of three basic parts
• A charged phosphate group
• Glycerol
• Two fatty acid chains
• (figure on board)

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• The cell membrane is made of two phospholipid
  layers embedded with other molecules, such as
  proteins, carbohydrates, and cholesterol.
• (figure on board)

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Fluid Mosaic Model

• Model that describes the arrangement and movement
  of the molecules that make up a cell membrane.

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Selective Permeability

• Semipermeable Condition or quality of allowing
  some, but not all, materials to cross a barrier
  or membrane.

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• A selectively permeable, or semipermeable,
  membrane allows some, but not all, molecules to
  cross.
• (Figure on board)