Question

The naturally occurring amino acid that contains only one basic functional group in its chemical structure is:

• A. arginine
• B. lysine
• C. asparagine
• D. histidine

Hint:

Basic amino acids have more than one amine functional group, while neutral amino acids have only one amine group.

Answer 1

The Correct Option is C

Step 1: Functional Group Identification in Amino Acids
- The chemical properties of amino acids are dictated by their distinct functional groups.
- Key basic functional groups are the amine (\(-NH_2\)) and imidazole moieties. 
Step 2: Categorization of Provided Choices 
- Arginine, Lysine, and Histidine are characterized by multiple basic groups within their side chains. 
- Asparagine possesses a single amine group, thus fulfilling the criteria.
Conclusion: Asparagine is identified as the correct option due to its sole amine functional group.