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

Question

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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.

Answer

<div>Arginine</div>

Answer

<div>Lysine</div>

Answer

<div>Histidine</div>

Answer

<div>Isoleucine</div>

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

The Correct Option is D

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