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?

Question

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?

BlackTom AI · Accepted Answer

Question restatement: Under anaerobic conditions with excess glucose, pyruvate and ATP production were measured, with a graph showing pyruvate production (solid line) and ATP levels peaking at A and C and dipping at B and D. A second culture added substance X under the same conditions. The prompt asks: Which of the following is most likely to result if oxygen is added to the tissue culture?

Option analysis:
- Option: For each glucose molecule consumed, more ATP will be formed.
  This statement aligns with fundamental bioenergetics. In the absence of oxygen, cells rely on anaerobic glycolysis, yielding only 2 ATP per glucose (net). When oxygen is available, pyruvate produced in glycolysis is shuttled into the mitochondria where acetyl-CoA enters the citric acid cycle and oxidative phosphorylation occurs. The electron transport chain uses O2 as the terminal electron acceptor, enabling a much larger yield of ATP per glucose molecule, typically around 30–32 ATP in many eukaryotic cells. Therefore, supplying oxygen would increase ATP yield per glucose, making this option a correct characterization of the expected metabolic shift.

Why this is likely correct in the context of the graph:
- The solid line shows pyruvate production across time under anaerobic conditions; if O2 were added, cells could oxidize more pyruvate via the aerobic pathway, leading to increased ATP production without necessarily a drastic change in pyruvate accumulation initially (pyruvate could funnel into acetyl-CoA and the TCA cycle). As ATP production climbs via oxidative phosphorylation, the overall energy state of the cell improves compared to anaerobic fermentation.

Why there are no alternative options to compare here:
- The provided data set includes only one answer choice. Since no other options are listed, there is no basis to evaluate other incorrect statements. In a typical multiple-choice scenario, we would assess each distractor for common misconceptions (e.g., assuming ATP production remains the same, or that oxygen would halt glycolysis entirely, or that only glycolysis contributes to ATP under aerobic conditions). Here, the core biological expectation when oxygen is present is an increased ATP yield per glucose molecule, which this option expresses.

In summary, the addition of oxygen enables aerobic respiration, substantially increasing ATP yield per glucose compared with anaerobic glycolysis, so the stated outcome—more ATP formed per glucose molecule—is the expected result.

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类似问题

What is the term for the process by which cells convert glucose into energy?

Question at position 14 Indirect calorimetry is based upon the concept that Oxygen is used in ATP production and ___ is a by-product of ATP production.NADHFADH2WaterCarbon dioxide

Question at position 13 For an unknown macronutrient, approximately 14 molecules of oxygen are required for oxidation and 10 molecules of carbon dioxide are produced. The RQ of this molecule is:0.930.830.711.00

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Which of the following stages of cellular respiration directly produces the LEAST reduced electron carriers?

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Which of the following cellular processes would be most directly interfered with (ignoring downstream processes) by a toxin that binds to pyruvate and inactivates it?

更多留学生实用工具

希望你的学习变得更简单

During cellular respiration, _ is reduced to eventually form _.