AP Biology : Cellular Respiration
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Example Questions
Example Question #4 : Understand Aerobic Respiration
In the process of cellular respiration, if no oxygen is available, what is the fate of the pyruvate molecules produced during glycolysis?
Used to produce protons to increase the proton gradient
Used for lactic acid or alcoholic fermentation
Used to produce oxygen
Used to produce more glucose
Used for lactic acid or alcoholic fermentation
If no oxygen is available, anaerobic respiration will occur. This can either be lactic acid fermentation, or alcoholic fermentation. In alcoholic or lactic acid fermentation, the pyruvate are decarboxylated and ultimately used to produce either ethanol or lactic acid, and regenerate NAD+ which will be reused for another cycle of glycolysis (2 ATP are produced for each round of glycolysis).
Example Question #2 : Understand Aerobic Respiration
Anaerobic respiration occurs when?
In the absence of
In the presence of
In the presence of
In the absence of
In the absence of
If no oxygen is available, anaerobic respiration will occur. This can either be lactic acid fermentation, or alcoholic fermentation. In alcoholic or lactic acid fermentation, the pyruvate are decarboxylated and ultimately used to produce either ethanol or lactic acid, and regenerate NAD+ which will be reused for another cycle of glycolysis (2 ATP are produced for each round of glycolysis).
Example Question #131 : Cellular Respiration
Where does anaerobic respiration occur in a cell?
Inner mitochondrial membrane
Mitochondrial matrix
Chloroplast
Cytosol
Cytosol
In the absence of oxygen, pyruvate produced during glycolysis will be used for either lactic acid or alcoholic fermentation, producing lactic acid or ethanol (as waste products) and regenerating NAD+ to be used for another cycle of glycolysis. This fermentation occurs in the cytosol of the cell.
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