BW 5 January 2015 BRAINSTORM: What do you know about Shakespeare?
Do Now! Brainstorm: What parts of a house separate it from its external environment? What may enter...
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Transcript of Do Now! Brainstorm: What parts of a house separate it from its external environment? What may enter...
Do Now!
• Brainstorm: What parts of a house separate it from it’s external environment?
• What may enter through those parts?
Cell Membrane
• Controls movement in and out of the cell
• Selectively permeable• Some substances can pass
freely.• Some substances can pass
to an extent.• Some not at all.• Allow cells to maintain
homeostasis.
View phospholipid animation
Lipids in the cell membrane
• The head is hydrophilic (love water)
• The tails are hydrophobic (hate it)
Phospholipids only let small molecules pass through
• How can the larger ones get in the cell?
Proteins in the CMB
• Proteins allow only certain molecules pass by based on their shape.
Carbohydrates in the cell membrane
• If you get a heart transplant can you get just anybodies heart?
• Allow cells to be recognized
Fluid Mosaic Model
• Show animation
Diffusion
• Collision of molecules• Molecules move from a
high concentration to low concentration
• This occurs because of a concentration gradient.
• Diffusion only occurs if their is a concentration gradient.
• If the concentration gradient no longer exist it is said to be at equilibrium.
Diffusion animation
Active Transport
• Do you think molecules can ever move against their concentration gradients?