The semipermeable membrane phospholipid bilayer
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The Semipermeable Membrane: Phospholipid Bilayer. Monday November 22, 2010. In your Notebook. Remember: Water is a polar molecule. Like Attracts Like. Warmup. Pass in Lab Reports Watch the demonstration. 1. Explain how water is interacting with the magic sand and clear spheres.

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The semipermeable membrane phospholipid bilayer

The Semipermeable Membrane:Phospholipid Bilayer

Monday November 22, 2010


In your notebook
In your Notebook

Remember: Water is a polar molecule.

Like Attracts Like


Warmup
Warmup

  • Pass in Lab Reports

  • Watch the demonstration.

  • 1. Explain how water is interacting with the magic sand and clear spheres.

  • 2. What does this tell you about the properties of these substances.




Heads and tails of the phospholipid bilayer
Heads and Tails of the Phospholipid Bilayer

http://telstar.ote.cmu.edu/biology/MembranePage/index2.html


  • Passive Transport Does Not Require ENERGY… Substances flow down the Concentration Gradient.

  • We’ve seen:

  • Water

  • Glucose

  • Iodine


Active transport requires energy to move molecules across the membrane
Active Transport Requires Energy to Move Molecules across the Membrane


Now let s model the phospholipid bilayer
Now: Let’s Model the Phospholipid Bilayer

  • Follow the directions on your worksheet.

  • Answer all questions.

  • Work in pairs; Each person must complete his/her own worksheet.


Quiz feedback

75% H20

25% NaCl

40% H20 60% NaCl

Quiz Feedback

  • Question #1:

  • Some common misunderstandings-

  • NaCl can pass through membrane

  • NaCl soaks up the water

  • The cell will actually swell

  • Hypotonic Solution

  • Question #2:

  • Looking for a basic definition of selective permeability and an example…

  • What were some examples in class??

  • #3: Think back to question #1, and the elodea lab

  • #4: Proteins can’t get re-absorbed (why?).

  • Glucose is mostly re-absorbed (why?)


Homework
Homework

  • Read BSCS Membranes Essay p. 220-221.

  • Complete reading guide questions in Notebook.


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