41.
A sample of starch suspension was tested with iodine solution and the result was a blue black colour. A second sample of starch suspension was tested with Benedict’s reagent and the result was a blue colour. A third sample of starch suspension was mixed with amylase and incubated at 30°C for 10 minutes and then tested with Biuret reagent. What was the resulting colour of the third sample?
A:
Blue
B:
Blue-black
C:
Brick red
D:
Purple
The answer is:
D
