Aerobic and Anaerobic Respiration in Yeast Cells

Living organisms catabolize organic molecules within their cells and use the energy released to manufacture ATP by phosphorylating ADP. Many prokaryotes and virtually all Eukaryotes phosphorylate ADP either through fermentation (anaerobic) or respiration (aerobic). Both of these processes involve oxidation of foodstuffs, yet only the latter requires oxygen.

Got that? Didn’t think so. Cellular respiration is a very complex process that consists of many steps that take place inside the cell, in an organelle called a mitochondrion. Mitochondria are responsible for converting digested nutrients into the energy-yielding molecule adenosine triphosphate (ATP) to fuel the cell's activities. This function, known as aerobic respiration, is the reason mitochondria are frequently referred to as the powerhouse of the cell. There are two types of respiration that occur in cells to produce energy. When oxygen is available in the cell, aerobic respiration, as mentioned previously, occurs. When oxygen is not r

The results of our experiment are very important not only to yeast, but to all organisms. Temperature can change all forms of life. Warmer temperatures hold less oxygen, thus triggering higher organism growth and respiration rates. What does this mean for us? Well, it means we produce energy at a faster rate when we are hot, compared to when we are cold.

After a half an hour of being emerged in their respective temperatures, we found that the yeast in the incubator, after being in a very warm temperature of 50 degrees Celsius, had the most dramatic CO2 production of the three tested. The yeast in the incubator had produced 4mL of CO2, much greater than the yeast in the cold temperature, that only produced .3mL of CO2, and the control, that produced 2.5mL of CO2.

For another experiment, I think it would be interesting to see how long it takes for a yeast solution in a cold environment to release the same amount of CO2 as a yeast solution in a hot environment. The same procedure would be followed, stabilizing the results.

When no oxygen is available, respiration can be performed through fermentati

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