1. Describe (in words) the overall structure of a lipid bilayer.
2. What are the properties (i.e., characteristics) of the lipid bilayer of a cell that
make it impermeable to ions and most molecules?
3. Describe the role of cholesterol in maintaining the fluidity of the lipid bilayer of a
cell?
4. The triglycerides in animals tend to be solids (i.e., fats) at room temperature
whereas the triglycerides in plants tend to be liquids (i.e., oils) at room
temperature. Based on this fact, what can you conclude about the characteristics
of the fatty acids in animal triglycerides compared to the fatty acids in plant
triglycerides?
5. Peanut oil contains a high percentage of monounsaturated triglycerides whereas
vegetable oil contains a higher percentage of polyunsaturated triacylglycerols. A
bottle of peanut oil and a bottle of vegetable oil are stored in a pantry with an
outside wall. During a cold spell, the peanut oil freezes, but the vegetable oil
remains liquid. Explain why.
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