Linolenic and linoleic fatty acids contain long carbon chains of 18 carbons each, but other fatty acids of similar size, such as steric acid and oleic acid, cannot replace them. These "essential ...

The carbons and oxygens of the carboxylic acid functional group are red. (B) This is the structure of oleic acid, an 18-carbon unsaturated fat. The carbons of the alkene functional group ...