III. Experiments Experiment 1. Alcoholic Fermentation In this lab you will exami

Question

III. Experiments Experiment 1. Alcoholic Fermentation In this lab you will examine alcoholic fermentation in a yeast cell, Saccharomyces cerevisiae, or "baker's yeast". Yeast cells can perform cellular respiration but often switch to alcoholic fermentation (facultative anaerobes). The carbon dioxide (CO2) produced in the reaction forms bubbles out of the solution which can be used as an indication of the relative rate of fermentation taking place. Fig. 2 shows the respirometers you will use to collect CO2 (1) Hypothesize about the effect of different concentrations of yeast on the rate of fermentation: . : b. Ha (2) Predict the results of the experiment based on your hypothesis (use an if/then statement). 100

Explanation / Answer

Ans 1) Hypothesis

Ans 2) On performing the experiment it was observed that the production of the carbon dioxide gradually increased with increase in the population of the yeast. If the concentration of yeast in high then in that it is observed that it switches to fermentation or facultative anaerobic process which leads to high production of the carbon dioxide.

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