SAT Subject Biology Practice Question 272: Answer and Explanation

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Question: 272

2. End product of anaerobic metabolism in muscle cells

A. Mitochondria
B. Cytoplasm
C. Pyruvate
D. Lactic acid
E. Glucose

Correct Answer: D


D When muscle cells run out of oxygen and switch to anaerobic metabolism (glycolysis only) to make ATP, the end product is lactic acid. Yeast can also switch to anaerobic metabolism; their end product is ethanol. You should have been able to eliminate choices A and B because they are not products.

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