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KEY CONCEPT The cell membrane is a barrier that separates a cell from the external environment.

KEY CONCEPT The cell membrane is a barrier that separates a cell from the external environment. Cell membranes are composed of two phospholipid layers. cell membrane. Cell membranes are composed of two phospholipid layers. The cell membrane has two major functions. cell membrane.

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KEY CONCEPT The cell membrane is a barrier that separates a cell from the external environment.

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  1. KEY CONCEPT The cell membrane is a barrier that separates a cell from the external environment.

  2. Cell membranes are composed of two phospholipid layers.

  3. cell membrane • Cell membranes are composed of two phospholipid layers. • The cell membrane has two major functions.

  4. cell membrane • Cell membranes are composed of two phospholipid layers. • The cell membrane has two major functions. • forms a boundary between inside and outside of the cell outside cell inside cell

  5. cell membrane • Cell membranes are composed of two phospholipid layers. • The cell membrane has two major functions. • forms a boundary between inside and outside of the cell • controls passage of materials outside cell inside cell

  6. Cell membranes are composed of two phospholipid layers.

  7. cell membrane • Cell membranes are composed of two phospholipid layers. • The cell membrane is made of a phospholipid bilayer.

  8. cell membrane • Cell membranes are composed of two phospholipid layers. • The cell membrane is made of a phospholipid bilayer. • Phospholipids are arranged with the hydrophilic heads pointing outwards and the hydrophobic tails pointed inwards.

  9. carbohydrate chain protein cell membrane cholesterol protein protein channel • Cell membranes are composed of two phospholipid layers. • The cell membrane is made of a phospholipid bilayer. • There are other molecules embedded in the membrane.

  10. carbohydrate chain protein cell membrane cholesterol protein protein channel • Cell membranes are composed of two phospholipid layers. • The cell membrane is made of a phospholipid bilayer. • There are other molecules embedded in the membrane. • The cell membrane is made up primarily of Lipids, but Proteins and Carbohydrates are also found there.

  11. carbohydrate chain protein cell membrane cholesterol protein protein channel • Cell membranes are composed of two phospholipid layers. • The cell membrane is made of a phospholipid bilayer. • There are other molecules embedded in the membrane. • The fluid mosaic model describes the membrane.

  12. carbohydrate chain protein cell membrane cholesterol protein protein channel • Cell membranes are composed of two phospholipid layers. • The fluid mosaic model describes the membrane. • Molecules that make up the membrane are always moving.

  13. Cell membranes are composed of two phospholipid layers.

  14. Cell membranes are composed of two phospholipid layers. • The cell membrane is selectively permeable. • Some molecules are able to cross the membrane while others cannot.

  15. Cell membranes are composed of two phospholipid layers. • The cell membrane is selectively permeable. Some molecules can cross the membrane while others cannot.

  16. Cell membranes are composed of two phospholipid layers. • The cell membrane is selectively permeable. Some molecules can cross the membrane while others cannot.

  17. Chemical signals are transmitted across the cell membrane. • Receptors bind with ligands and change shape. • There are two types of receptors.

  18. Chemical signals are transmitted across the cell membrane. • Receptors bind with ligands and change shape. • There are two types of receptors. • intracellular receptor

  19. Chemical signals are transmitted across the cell membrane. • Receptors bind with ligands and change shape. • There are two types of receptors. • intracellular receptor • Chemical signals are sent on a ligand through the membrane and bind to a receptor inside the cell itself.

  20. Chemical signals are transmitted across the cell membrane. • Receptors bind with ligands and change shape. • There are two types of receptors. • intracellular receptor • membrane receptor

  21. Chemical signals are transmitted across the cell membrane. • Receptors bind with ligands and change shape. • There are two types of receptors. • intracellular receptor • membrane receptor • Receptors are found embedded in the membrane and allow for communication between the cell and the outside world.

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