Fermentation in yeast
A - VCE - SSCE Biology - Question 10 - 2009 - Paper 1
Question 10
Fermentation in yeast
A. produces ethanol.
B. requires lactic acid.
C. involves the Kreb's cycle.
D. requires the presence of oxygen.
Worked Solution & Example Answer:Fermentation in yeast
A - VCE - SSCE Biology - Question 10 - 2009 - Paper 1
Step 1
A. produces ethanol.
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Answer
Fermentation in yeast primarily produces ethanol as a byproduct of anaerobic respiration. During the process of alcoholic fermentation, glucose is converted into ethanol and carbon dioxide, which is a characteristic reaction of yeast metabolism.
Step 2
B. requires lactic acid.
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Answer
This statement is incorrect. Fermentation in yeast does not require lactic acid; instead, it ends with the production of ethanol and carbon dioxide.
Step 3
C. involves the Kreb's cycle.
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Answer
This is not accurate for fermentation in yeast. The Kreb's cycle, also known as the citric acid cycle, occurs in aerobic respiration and is not part of the fermentation pathway in yeast.
Step 4
D. requires the presence of oxygen.
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Answer
This is false. Fermentation in yeast specifically occurs in anaerobic conditions, meaning it does not require oxygen. In fact, the presence of oxygen would lead yeast to undergo aerobic respiration instead.
