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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Presentation Transcript
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

slide7

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

  • We’ve seen:
  • Water
  • Glucose
  • Iodine
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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