Editing Holy Bread (section)

== What to Say ==

-Hold up a piece of bread. Ask if anyone has ever noticed just how “holy” it is?

-What do we think made these holes? Actually, a little tiny microorganism made these holes. Lets find out how.

-What do we breathe in and out? (in = Oxygen, out= Carbon Dioxide). This is the same for all animals. And although yeast aren’t animals – they are fungi, they still breathe like you and I.

-(pick up the erlenmeyer flask and blow bubbles, changing the color from blue green to yellow. OR have a volunteer from the class do it.)

- Explain – when we exhale, we breathe out carbon dioxide. The carbon dioxide in our breath combines chemically with the water in this beaker to form carbonic acid. And remember, we added indicator - a kind of dye that changes color in the presence of an acid, turning yellow.

-So now, lets look at our experiment. Yeast are revived by adding sugar (food) and heat. Then they begin to grow. The carbon dioxide produced by the yeast turns the solution yellow.

- Let the kids look through the microscope. See if you can find any cells budding. Budding is a type of reproduction, except it happens very quickly. Because they can reproduce so quickly, they use a lot more food than you or I.