Pratik was performing an experiment to test for the presence of starch and
glycogen in different types of foods. He treated four food samples with a Lugol's
iodine reagent. This solution is brown-yellow, but it produces a blue-black color
when it reacts with starch and a brown-blue color when it reacts with glycogen.
Which samples would test positive for starch or glycogen in this
experiment? Select all that apply.
Banana
Table sugar
Liver
Potato flakes