Question

what evidence would you need to support the claim that a sample contains a protein? an iodine test result that is dark brown or black a biuret test result that is purple an iodine test result that is yellow or amber a biuret test result that is blue

Explanation:

The biuret test is used to detect proteins. In the presence of proteins, the biuret reagent reacts to produce a purple - colored complex. Iodine tests are used for detecting starch, not proteins. A dark - brown or black iodine test result indicates starch presence, a yellow or amber iodine test result is a negative for starch. A blue biuret test result is a negative for proteins.

Answer:

B. a biuret test result that is purple