Standard colors in biochemical tests for biomolecules

Steps:

• Identify tests: Benedict's for reducing sugars (fructose), iodine for starch, emulsion for triglycerides.
• Recall positive results: Benedict's yields red precipitate for fructose; iodine yields blue-black (often simplified as black) for starch; emulsion test yields white milky suspension for triglycerides.
• Compare choices to these standard colors.
• Select the option matching all three correctly.

Why B is correct:

• It assigns red to fructose (Benedict's positive for reducing sugars), black to starch (iodine positive), and white to triglyceride (emulsion positive), aligning with standard biochemical test outcomes.

Why the others are wrong:

• A: Purple for starch and red for triglyceride mismatch iodine (black) and emulsion (white) results.
• C: Purple for fructose mismatches Benedict's (red) result.
• D: Red for starch mismatches iodine (black) result.

Final answer: B