Yeast Reaction Lab Report

In this lab my group and I tested to see how yeast would react to different substances. Yeast is a fungi that releases carbon dioxide which can be used in the process of bread making. During this lab we used sugar, warm water, cornstarch, yeast, a gas sensor, plastic cylinders, and a laptop. The process of this lab was to create cellular respiration, which is what cells do to break up sugars into a form that the cell can use as energy. When yeast and a certain substance were combined, this substance together would release a certain amount of oxygen, this varied over the course of six minutes. We tested the yeast a total of four times using the gas sensor each time. The gas sensor would be left in the bottle for at least six minutes. The oxygen
The first test, we combined yeast with cornstarch in a plastic cylinder and let it sit with the gas sensor on top for six minutes, or until the graph stopped recording. The oxygen level was not constant for this mixture. Although there was no liquid added to this mixture, the yeast gave off a lot of carbon dioxide. The oxygen level started low and picked up a minute after the mixture was left alone. For the next trial, we combined the yeast with warm water and cornstarch in a plastic cylinder, with the gas sensor on top. The oxygen level started out low and slowly picked up during the middle of the experiment. The third trial we combined yeast with water. The oxygen level started out really high and it slowly deteriorated towards the end of the experiment. The final trial we combined yeast, sugar, and water. Like the first and second trial, the oxygen level started out low and then the oxygen level increased as the mixture was left untouched. This mixture of yeast combined with sugar and warm water made the yeast foam up after a couple of minutes. The foam laid on the top of the mixture as the oxygen level increased. Each time a gas sensor was placed onto a plastic cylinder containing a substance, this sensor would be hooked up to a laptop. The laptop would be recording how much oxygen our substance would be
How does the type of food source affect the rate of cellular respiration? Each substance that is mixed in with the yeast releases oxygen slowly over the course of a couple of minutes. When the cornstarch was added to the yeast it slowed down the release of oxygen in the beginning of the experiment. When liquid was added to the yeast, the release of oxygen was fast and it started out at a high point. When another dry substance was added to the yeast is slowed down the substance’s release of oxygen. The yeast itself already gives off a lot of gas. The liquid helps the yeast release oxygen faster than another dry