Question

25
multiple choice 5 points
a tissue culture of vertebrate muscle was provided with a constant excess supply of glucose under anaerobic conditions starting at time zero and the amounts of pyruvic acid and atp produced were measured. the solid line in the graph above represents the pyruvic acid produced in moles per liter per minute. atp levels were also found to be highest at points a and c, lowest at b and d. a second culture was set up under the same conditions, except that substance x was added, and the results are indicated by the dotted line.
which of the following is most likely to result if oxygen is added to the tissue culture?
lactic acid formation will increase.
for each glucose molecule consumed, more atp will be formed.
the levels of atp produced will decrease.
no change in the production of pyruvic acid will be observed.
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Explanation:

When oxygen is added, the muscle tissue will shift from anaerobic to aerobic respiration. In anaerobic respiration (like lactic acid fermentation), only a small amount of ATP is produced per glucose molecule (2 ATP). In aerobic respiration, a much larger amount of ATP is produced per glucose molecule (up to 38 ATP). Lactic acid formation is a part of anaerobic respiration and will decrease when oxygen is available. Pyruvic acid is further metabolized in the mitochondria in aerobic conditions, so its production pattern will change. The ATP levels will increase due to the more efficient aerobic pathway.

Answer:

For each glucose molecule consumed, more ATP will be formed.