Joey's Inquiry- Yeast

1.  Why does yeast make bread rise?

2.  http://www.sciencebuddies.org/science-fair-projects/project_ideas/MicroBio_p011.shtml#background

http://www.exploratorium.edu/cooking/bread/activity-yeast.html

• I learned yeasts are microorganisms that are more closely related to a mushroom [ they are a single celled fungi ] than to bacteria.
• I learned that fungi is not green, do not have chlorophyll, and cannot undergo photosynthesis to make their own food.
• I learned that yeast uses sugars (simple carbohydrates) and starches (complex carbohydrates) as food sources.

3.  Hypothesis:  It needs to be the right time of year to grow yeast.

4.

5. We saw the balloon blow up and the yeast came up.  

6. My hypothesis was incorrect. The balloon gets blown up because of the air bubbles. We put in yeast, sugar, and hot water. The yeast eats the sugars and makes carbon dioxide.