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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 water-loving ________ and water-fearing ________ regions.


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


6List one solute with high permeability and one solute with very low permeability.


7Describe how the polar and nonpolar regions are oriented to form the bilayer of a cellular membrane.


8Molecules with hydrophilic and hydrophobic regions are ________.
A)hydropolar
B)amphipathic
C)amphibious
D)hydropathic


9Proteins in a cellular membrane are fixed in position.
A)True
B)False


10The ____ 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)glucolipid
D)glucoprotein


11List two functions of proteins in cellular membranes.


12In today's lab, you will study the effect of stress on cellular membranes. What two stresses will you use?


13How do extreme temperatures affect cellular membranes?


14How do organic solvents affect cellular membranes?


15Organic solvents are flammable and should be treated with caution.
A)True
B)False


16Organic solvents can be poured down the drain.
A)True
B)False





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