Question

remaining time: 13 minutes, 08 seconds. question completion status: question 9 which of the following processes occurs when o2 is unavailable to a cell? a. pyruvate oxidation b. the citric acid cycle c. fermentation d. formation of h2o by the electron transport chain question 10 the fermentation process in vertebrate muscle cells produces a. lactic acid. b. 12 moles of atp. c. pyruvic acid. d. an excessive amount of energy.

Explanation:

• For Question 9: Pyruvate oxidation, the citric - acid cycle, and formation of H₂O by the electron - transport chain all require oxygen. Fermentation is an anaerobic process that occurs when oxygen is unavailable.
• For Question 10: In vertebrate muscle cells, fermentation converts pyruvate to lactic acid. It does not produce 12 moles of ATP, pyruvic acid is a reactant in muscle - cell fermentation, and it does not produce an excessive amount of energy.

Answer:

• Question 9: C. Fermentation
• Question 10: A. lactic acid