Fatty acids are amphipathic.

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Multiple Choice

Fatty acids are amphipathic.

Amphipathic character is what fatty acids exhibit: they have a polar, hydrophilic carboxyl head and a long nonpolar, hydrophobic tail. This dual nature means the head can interact with water while the tail avoids it, driving the molecule to organize into structures like micelles or lipid bilayers in aqueous environments. That’s why amphipathic is the best descriptor. Describing them as hydrophobic only captures the tail, while hydrophilic or polar describes just the head; neither fully reflects the molecule as a whole.

Amphipathic character is what fatty acids exhibit: they have a polar, hydrophilic carboxyl head and a long nonpolar, hydrophobic tail. This dual nature means the head can interact with water while the tail avoids it, driving the molecule to organize into structures like micelles or lipid bilayers in aqueous environments. That’s why amphipathic is the best descriptor. Describing them as hydrophobic only captures the tail, while hydrophilic or polar describes just the head; neither fully reflects the molecule as a whole.

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