Anaerobic Respiration
of Yeast Pre - lab
Review Exam
Q&A
2024
, 1. Describe the process of anaerobic respiration in yeast. How does it
differ from aerobic respiration?
Answer: Anaerobic respiration in yeast involves the breakdown of glucose
into ethanol and carbon dioxide in the absence of oxygen. This process is
different from aerobic respiration, which requires oxygen and produces
much more ATP.
2. What is the role of yeast in anaerobic respiration? How does it generate
energy in the absence of oxygen?
Answer: Yeast plays a crucial role in anaerobic respiration by fermenting
glucose to produce ethanol and carbon dioxide. This process generates
ATP by breaking down glucose through glycolysis and the fermentation
pathway.
3. Explain the significance of the enzyme alcohol dehydrogenase in the
fermentation process of yeast.
Answer: Alcohol dehydrogenase is an enzyme responsible for converting
acetaldehyde to ethanol during the fermentation process. This conversion
is essential for producing ethanol and regenerating NAD+ for glycolysis
to continue.
4. What factors can affect the rate of anaerobic respiration in yeast? How
do these factors impact the overall fermentation process?
Answer: Factors such as temperature, pH, substrate concentration, and the
presence of inhibitors can affect the rate of anaerobic respiration in yeast.
These factors can either promote or inhibit enzyme activity, ultimately
affecting the rate of fermentation.
5. Discuss the role of NAD+ in the anaerobic respiration of yeast. How is
it regenerated during the fermentation process?
Answer: NAD+ is a coenzyme that plays a critical role in glycolysis by
accepting electrons and becoming reduced to NADH. In anaerobic
respiration, NAD+ is regenerated through the conversion of acetaldehyde
to ethanol by alcohol dehydrogenase.
6. How does the production of ethanol in yeast fermentation impact the
brewing and baking industry?
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