T HE S EMIPERMEABLE M EMBRANE : P HOSPHOLIPID B ILAYER Monday November 22, 2010.
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Transcript of T HE S EMIPERMEABLE M EMBRANE : P HOSPHOLIPID B ILAYER Monday November 22, 2010.
THE SEMIPERMEABLE MEMBRANE:PHOSPHOLIPID BILAYER
Monday November 22, 2010
IN YOUR NOTEBOOKTerm Definition Polar or
Non-PolarExample
Hydrophobic
Hydrophilic
Remember: Water is a polar molecule.
Like Attracts Like
WARMUP
Pass in Lab ReportsWatch 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.
THE PHOSPHOLIPID BILAYER
IN YOUR NOTES, SKETCH AND LABEL A SINGLE PHOSPHOLIPID.
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:
WaterGlucoseIodine
ACTIVE TRANSPORT REQUIRES ENERGY TO MOVE MOLECULES ACROSS THE MEMBRANE
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
Question #1:Some common misunderstandings- NaCl can pass through membraneNaCl soaks up the waterThe cell will actually swellHypotonic 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
Read BSCS Membranes Essay p. 220-221.
Complete reading guide questions in Notebook.