What feature do fatty acids have?

What feature do fatty acids have?

• A. long hydrocarbon tails
• B. short hydrocarbon tails
• C. aromatic rings
• D. hydrophilic heads

Answer: (A)

Fatty acids are built with a polar carboxyl head and a long nonpolar hydrocarbon tail. The defining feature is that long hydrocarbon tail—the chain of carbon-hydrogen bonds makes the tail hydrophobic, which is why fatty acids (and lipids more broadly) behave as nonpolar, energy-dense components in cells. The polar head does exist and is hydrophilic, but the standout trait that shapes their chemical behavior is the lengthy hydrophobic tail. Aromatic rings aren’t a part of fatty acids, and while some fatty acids can be shorter, the classic, characteristic form has a long tail.

Fatty acids are built with a polar carboxyl head and a long nonpolar hydrocarbon tail. The defining feature is that long hydrocarbon tail—the chain of carbon-hydrogen bonds makes the tail hydrophobic, which is why fatty acids (and lipids more broadly) behave as nonpolar, energy-dense components in cells. The polar head does exist and is hydrophilic, but the standout trait that shapes their chemical behavior is the lengthy hydrophobic tail. Aromatic rings aren’t a part of fatty acids, and while some fatty acids can be shorter, the classic, characteristic form has a long tail.