The naturally occurring amino acid that contains only one basic functional group in its chemical structure is:
- Arginine
- Lysine
- Histidine
- Isoleucine
The Correct Option is D
Solution and Explanation
Let us analyze the functional groups present in each of the given amino acids:
1. Histidine: Histidine contains an imidazole group, which is basic. It also contains the amino group (\(-\text{NH}_2\)), making it contain two basic functional groups.
2. Lysine: Lysine contains an \(-\text{NH}_2\) group and a terminal amino group in its side chain. Therefore, it contains two basic functional groups.
3. Asparagine: Asparagine contains an amide group (\(-\text{CONH}_2\)) in its side chain, which is neutral, and only one amino group (\(-\text{NH}_2\)). Therefore, it contains only one basic functional group.
4. Arginine: Arginine contains a guanidinium group, which is strongly basic, along with the \(-\text{NH}_2\) group. Therefore, it contains more than one basic functional group. ### Conclusion: The only amino acid that contains one basic functional group is Asparagine.
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