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Storyboard Text

  • It was a usual day. At various times throughout the day molecules would move across my membrane in a process called diffusion. The small molecules, like my friend the water molecule  freely pass through the phospholipid bilayer of my memebrane. I was very familiar with the small molecules. 
  • I'm difusing into the membrane!
  • But wait a minute... who are these molecules trying to enter? I don't know who these molecules are so I'll send them to the carbohydrate chains to see if they are safe to come in. 
  • The  carbohydrate chains help protect me (the cell) against foreign molecules. 
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