Question

Which of these characteristics best represents a fatty acid molecule?

Answer 1

The structure of fatty acids is a long linear chain composed of many carbon atoms and a carboxylic group in one of the molecules extremes. Among the options, the molecule represented with an F is the correct one.

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Fatty acids compose the lipids and glycolipids.

A fatty acid is a carboxylic acid of lipidic nature.

They are composed of a long linear hydro carbonated chain.

The chain size varies according to the number of carbon atoms composing the chain. There might be from 12 to 24 carbons.

Fatty acids are amphipathic molecules, showing a carboxylic group and a hydro carbonated chain.

COOH group is hydrophilic, while the chain is hydrophobic.

The longer is the chain, the more amphipathic and the less soluble it turns the molecule.

Fatty acids can be

• Saturated molecules ⇒ they do not have double bonds, so the chain is flexible.
• Unsaturated ⇒ there are double or triple bonds, making the chain rigid.

 

The molecule represented by the letter F is the only one that feets these characteristics. This is a linear molecule, with a COOH group in one of the extremes and a linear chain composed of carbon atoms.

Option F is the correct answer.

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