Phospholipids, with one end polar and the other nonpolar form a major part of cell membranes. They limit the entry and exit of molecules into and out of cells.

■ What are the two main types of lipids and how do they differ from one another?

■ What are the main functions of lipids in cells?

■ Some molecules such as many alcohols are soluble in water and in hydrophobic liquids such as oils. How easily do you think these molecules would cross the cell membrane?

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