FUNCTIONS of the CELL
MEMBRANE
The cell membrane does all of the following EXCEPT:
1) Identifies cells
2) Contain genetic information to make new cells
3) Transports materials
4) Protects the cell
TERMINOLOGY
 WHICH OF THESE TERMS MEAN TO LOVE
WATER?
1) Amahydric
2) Hydrophobic
3) Hydroamarone
4) Hydrophillic
 WHICH ONE OF THESE TERMS DESCRIBES OF
THE CELL MEMBRANE:
1) Simple (made out of one thing)
2) Complex (made out of many things)
I NEED A VOLUNTEER FOR THIS
ONE…
WHAT IS THIS?
A LITTLE LESSON FROM THE LITTLE
GUY…
What term describes the membrane’s selectivity in
determining what it allows to pass through?
1) Fully permeable
2) Semi-permeable
3) Not permeable
WHAT LESSON CAN WE LEARN FROM THE CELL???
OK, NOW FOR THE HARDER ONES…
Which part of the fluid mosaic model accounts for the
FLUID (liquid-like) portion?
1) Proteins
2) Carbohydrates
3) Phospholipids
4) Nucleic Acids
STRUCTURE…
 Which part of the fluid- mosaic model accounts for
the solid-like “mosaic” portion?
1) Proteins
2) Carbohydrates
3) Phospholipids
4) Nucleic Acids
Chemistry is everything….
 What end (if any) of the phospholipid is polar?
 Which end (if any) is nonpolar?
1) Head- polar
2) Head- nonpolar
3) Head- polar
4) Head- nonpolar
Tail- nonpolar
Tail-polar
Tail- polar
Tail- nonpolar
STRUCTURE/FUNCTION THEME
rears its Head again….ba dum cha
 How is the structure (polarity) of the phospholipid
Head related to the function in water detection.
TRANSLATION: IS THE PHOSPHOLIPID HEAD
POLAR OR NOT? DOES IT ATTRACT WATER OR
NOT?
Topic: Structure/function of cell membrane
relationship
RESEARCH DO NOW:
1) What are the solid portions of the fluid mosaic model? (mosaic of what???)
http://www.pbslearningmedia.org/asset/tdc02_int_membraneweb/
http://www.phschool.com/science/biology_place/biocoach/biomembrane1/structure.html
2) What are the roles of each molecule type in the structure of the cell membrane?





A. Cholesterol
B. Transport/Carrier protein
C. Receptor protein
D. Channel protein
E. Cell recognition
http://www.biologycorner.com/APbiology/cellular/notes_cell_membrane.html
3. What kinds of substances naturally (without energy) can pass? Which cannot?
4. How does the cell compensate for the substances that cannot pass through?
http://www.phschool.com/science/biology_place/biocoach/biomembrane1/structure.html
ACTIVITY: START (if time permits) BUILD A MEMBRANE ACTIVITY- in pairs (hands on)
CELL MEMBRANE (electronically on)
http://learn.genetics.utah.edu/content/cells/insideacell/
Hmwk: Complete lab write up for tomorrow