Final answer:
Proline amino acid does not give a positive biuret test because it does not have the necessary chemical structure.
Step-by-step explanation:
The biuret test is a common test for proteins, and it involves reacting proteins with copper sulfate in a strong alkaline solution. A positive result is indicated by a color change from blue to purple. Amino acids are the building blocks of proteins, and each amino acid has a different structure. Proline is an amino acid that does not have the necessary chemical structure to produce a positive biuret test. Therefore, proline would not give a positive biuret test.