Lipids differ from other large biological molecules in that they _____.

Organic molecules are composed of carbon and hydrogen, they're divided into four major classes: proteins, nucleic acids, carbohydrates, and lipids. Lipids are divided into two categories:

Long chains of carbon atoms accompanied by hydrogen atoms, such as fatty acids
Molecules in which carbon atoms are attached as multiple ring structures that are fused, such as cholesterol.

Both kinds of lipids share an important behavior, they don't readily dissolve in water, but they are soluble in many organic solvents. This is related to their polarity, the electrons in lipids are distributed unevenly creating a molecule that can have a partial positive charge and another part with a partial negative charge.

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