Is+Yeast+Alive

Scientific experiments for Metabolism
Hypothesis:
 * 1) Yeast produces a gas when sugar is available.
 * 2) Yeast does not produce a gas when sugar is not available.

Yeast will respire in the presence of glucose. Gas produced is carbon dioxide.


 * 1) Discussion of Results
 * 2) Evidences that yeast cells are alive
 * 3) How does yeast help bread dough to rise
 * 4) Place a few grains of yeast in a yeast culture, do you think it will be able to grow after a day or two?


 * 1) **The yeast produces CO^2.**
 * 2) **They respire.**
 * 3) **It produces gas that allows the bread to rise due to air spaces.**
 * 4) **No. It needs water.**