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Put 1 teaspoon of cornstarch in a pint of water.

Remove a spoonful of the mixture and add a little dilute iodine. (It will turn blue indicating the presence of starch.) Add a yeast cake to the jar.

Repeat the iodine test several times a day. (The color will show less and less starch until none is left.)

If you test for the presence of sugar during this activity, you will realize that the yeast uses the starch for food and turns it into sugar.

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