Which of the following best explains why ATP production is greater in the tube with oxygen than the tube without oxygen?

45. Which of the following scientific questions could be investigated using a similar experimental setup?

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47. Students in a class measured the mass of various living organisms. They then kept the organisms in thedark for 24 hours before remeasuring them. None of the organisms were provided with nutrients during the24-hour period. The data are as follows.Which of the following is the best explanation for the pattern of change in mass of the organisms over time?

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125. The enzyme phosphofructokinase (PFK) is an allosterically regulated enzyme that catalyzes the following reaction.Fructose-6-phosphate + ATP ? Fructose-1,6-bisphosphate + ADPThe graph below shows that at certain concentrations ATP inhibits the enzyme, whereas AMP activates it.According to the information presented in the graph, when the concentration of fructose-6-phosphate is 0.5 mM,how many times more active is PFK in cells with 1 mM ATP + 0.1 mM AMP than in cells with 5 mM ATP?Express your answer to the nearest whole number.13. The diagram below shows energy changes in a specific chemical reaction with and without the addition of an enzyme to thereaction.