Army Special Forces soldiers wearing their distinctive green berets in 2001. U.S. Army Special Forces adopted the Green Beret unofficially in 1954 after searching for a piece of headgear that would set them visually apart.
Submitted 8 years 4 months ago by admin. An objective test is a test that has right or wrong answers and so can be marked objectively. It can be compared with a subjective test, which is evaluated by giving an opinion, usually based on agreed criteria. Objective tests are popular because they are easy to prepare and take, quick to mark, and provide a quantifiable and concrete result.
The characteristic color of a positive biuret test. The biuret test is a chemical test used for detecting the presence of peptide bonds. In the presence of peptides, a copper (II) ion forms violet-colored coordination complexes in an alkaline solution.Several variants on the test have been developed, such as the BCA test and the Modified Lowry test.he biuret reaction can be used to assess the concentration of proteins because peptide bonds occur with the same frequency per amino acid in the peptide. The intensity of the color, and hence the absorption at 540 nm, is directly proportional to the protein concentration, according to the Beer-Lambert law.