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1Approximately how thick are cellular membranes?
A)6-10 mm
B)6-10 µm
C)60-90 µm
D)6-10 nm
E)60-90 nm


2List four functions of cellular membranes.


3Cellular membranes consist of a ________ bilayer with ________ embedded within or attached to this bilayer.


4Phospholipids have both ________ (charged) and ________ (uncharged) regions.


5A phospholipid molecule consists of a phosphate group, glycerol, and two fatty acids. Which of these are polar and which are nonpolar?


6Define hydrophilic.


7Define hydrophobic.


8Describe how the polar and nonpolar regions are oriented to form the bilayer of a cellular membrane.


9Molecules with hydrophilic and hydrophobic regions are ________.
A)hydropolar
B)amphipathic
C)amphibious
D)hydropathic


10Proteins in a cellular membrane are fixed in position.
A)True
B)False


11The ____ model describes the organization and structure of a membrane's lipid bilayer interspersed with embedded proteins that move about freely and aid in cross-membrane transport.
A)fluid mosaic
B)amphipathic
C)betcyanin
D)glucoprotein


12List two functions of proteins in cellular membranes.


13In today's lab, you will study the effect of stress on cellular membranes. What two stresses will you use?


14How do extreme temperatures affect cellular membranes?


15How do organic solvents affect cellular membranes?


16Organic solvents are flammable and should be treated with caution.
A)True
B)False


17Organic solvents can be poured down the drain.
A)True
B)False





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