Answer:
cholesterol.
Explanation 
Options a, d, c, and e all contains amino acids units. They are therefore  made up of protein  structure. cholesterol contains alcohol and steroids. it belongs to the steroid lipid  family unlike other options  that belong to protein family. 
 
        
                    
             
        
        
        
Amino acids are acids on one hand, and a base on the other hand. 
<h3>What is an acid?</h3>
An acid is a substance that produces hydrogen or hydroxonium ions as the only positively charged ion when it ionizes. 
All amino acids have an amine group - and a carboxylic group -
 and a carboxylic group - .
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The carboxylic group ionizes such that:

The presence of the amine group enables amino acids to also act as a base. 
More on amino acids can be found here: brainly.com/question/14583479
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