Acids Muscle
18
Jan/090
Jan/090
If a child is born with a rare disease in which mitochondria are missing in skeletal muscle cells. Physicians?
find that the muscles function. Not surprisingly, they also find that
A. the muscles contain large amounts of lactic acid following even mild exercise.
B. The muscles contain large amounts of carbon dioxide following even mild exercise.
C. The muscles require extremely high levels of oxygen to function
D. The muscle cells cannot split glucose into pyruvic acids.
E. The muscles require extremely high levels of carbon dioxide to function.
A. the muscles contain large amounts of lactic acid following even mild exercise is the correct answer.
The lack of mitochondria means that the cells cannot produce ATP through the krebs cycle and the electron transport chain. The ATP from glycolysis is used to fuel the cell. The NADH produced in glycolysis must be recycled into NAD+, so the cell reduces the pyruvate produced during glycolysis into lactic acid (called fermentation).
A. Correct answer.
B. Incorrect b/c carbon dioxide is produced by the body in the mitochondria.
C. Incorrect b/c the muscles only need oxygen if the electron transport chain in the mitochondria is running. Oxygen is the final electron acceptor.
D. Incorrect b/c glycolysis occurs in the cytoplasm, not the mitochondria.
E. Incorrect b/c the cells produce carbon dioxide, not consume it.
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