Question

1. now lets make some observations using the negative control group. iki, the indicator of starch, is already in the test tube. a 1% starch solution without amylase is then added to the test tube. · verify the ph is set to negative control. · load the video and click play. describe the observations from the video. the early time samples are black, and the later time samples are yellow. all of the time samples are dark black/blue in color. the early time samples are yellow, and the later time samples are black. all of the time samples are yellow. submit answer 0 / 2 submissions used

Explanation:

IKI is an indicator for starch. In the absence of amylase (which breaks down starch), starch remains present. IKI reacts with starch to give a dark - black/blue color. Since there is no amylase to break down the starch in the negative control, all time samples should show the color reaction of IKI with starch.

Answer:

All of the time samples are dark black/blue in color.