Question

1. which of the following shows the results that you would get if you tested beef using the four tests in the gizmo?

a
b
c
d
test tubes a
test tubes b
test tubes c
test tubes d

Explanation:

• Benedict’s test: Tests for reducing sugars (e.g., glucose). Beef has very little to no reducing sugars, so it should show a negative result (blue color, like in options B, C, D).
• Lugol’s test: Tests for starch. Beef has no starch, so it should show a negative result (amber - orange color, like in options A, C, D).
• Biuret test: Tests for proteins. Beef is rich in proteins, so it should show a positive result (violet color). Only option C has a positive Biuret test result.
• Sudan Red test: Tests for lipids. Beef has lipids, so it should show a positive result (red - stained lipid droplets, like in option C).

Answer:

C. test tubes C