CP Ryan and Michael

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Ryan and Kiseong

Testing Yeast Growth




Introduction(Ryan)

    1. Background
      1. The Purpose of this lab is to test and observe the growth of the yeast and also test different variables on the yeast.
      2. During this lab, we focused on the change in growth by adding or subtracting the amount of yeast. The main idea of this lab is cellular respiration. Cellular respiration is the metabolic processes whereby certain organisms obtain energy from organic molecules; processes that take place in the cells and tissues during which energy is released and carbon dioxide is produced and absorbed by the blood to be transported to the lungs.

    2. Experimental Design
      1. If the Amount of Yeast is changed, will that also affect the total amount of growth?
      2. The independent variable is the Yeast.
      3. The dependent variable is the amount of Yeast.
      4. We used centimeters to see the change in growth.
      5. We used the original amount of Yeast as the baseline.
    3. Hypothesis
      1. If the Amount of Yeast is increased, then the total growth will be increased.

Methodology and Procedure(Michael)

We focused on Yeast on this experiment. We had everything else on the same condition as we did 4 experiment. By only changing the grams of yeast. We figured out that yeast affects the length growing over time. The solution on 0 grams of yeast had 0cm, 1gram 0.7cm, 2gram 1cm, and 3gram 1.5cm so we can tell yeast affect the growth rate. The conclusion we got was more yeast more length that will grow.

    1. We did 4 experiment with different grams of yeast.


Control

    • || Yeast || 3gram || 2gram || 1gram || 0gram ||
    • || Sugar || 2gram || 2gram || 2gram || 2gram ||
    • || Water || 25ml || 25ml || 25ml || 25ml ||
    • || Time || 10min || 10min || 10min || 10min ||
    • || Growth || 1.5cm || 1cm || 0.7cm || 0cm ||

Data and Results(Michael)

    1. || || || || || Control ||
      || Yeast || 3gram || 2gram || 1gram || 0gram ||
      || Sugar || 2gram || 2gram || 2gram || 2gram ||
      || Water || 25ml || 25ml || 25ml || 25ml ||
      || Time || 10min || 10min || 10min || 10min ||
      || Growth || 1.5cm || 1cm || 0.7cm || 0cm ||
We observed that the yeast stuck in the bottom if you don't mix it well.external image placeholder?w=578&h=337

Discussion and Analysis(Ryan)

    1. Michael and I thought that if we would increase the amount of yeast, the total growth would be higher and if we decreased the amount of yeast, the total growth over 10 minutes would be shorter, and we were correct. This means that when yeast is mixed with 25 Ml of H20, 2 grams of sugar, over a ten minute period, the total growth of the solution will increase. If I were to change this experiment or improve upon my results, I would try to be more accurate when measuring the total growth and make sure the amount of solution used is exactly correct. Some limitations to this could be weather, amount of time, and the brand of the solution. A few questions could include, Is there a limitation to the amount of Yeast before it will start decreasing?


Works Cited

    1. "WordNet Search - 3.1." WordNet Search - 3.1. N.p., n.d. Web. 17 Feb. 2014.