Question

view the molecules below. identify which biological indicator test (if any) would have a positive result if the molecule was included in a test sample.

1. indicator:
2. indicator:
3. indicator:
4. indicator:
5. indicator:
6. indicator:
7. indicator:

Explanation:

1. This is a polypeptide. Biuret test is used to detect proteins/polypeptides. It will give a positive result as it has peptide - bonds.
2. This is a monosaccharide (glucose - an aldose). Benedict's test is used to detect reducing sugars like monosaccharides. It will give a positive result.
3. This is a tyrosine amino - acid. Ninhydrin test is used to detect free amino - acids. It will give a positive result.
4. This is a triglyceride. Sudan III test is used to detect lipids like triglycerides. It will give a positive result.
5. This is a polysaccharide (starch). Iodine test is used to detect starch. It will give a positive result.
6. This is a monosaccharide (ribose). Benedict's test will give a positive result for this reducing sugar.
7. This is a nucleic - acid. Diphenylamine test is used to detect DNA. If it's DNA, it will give a positive result.

Answer:

1. Biuret test
2. Benedict's test
3. Ninhydrin test
4. Sudan III test
5. Iodine test
6. Benedict's test
7. Diphenylamine test (if it's DNA)