24
QuizMultiple Choice

Catalysts — Unit test

Question 24 • PA Human Anatomy & Physiology A 2026-2027 SMITH IC

Which statement correctly compares and contrasts the three stages of cellular respiration that occur in the presence of oxygen?

Answer
A
Each stage occurs in the mitochondria, but only the final stage produces ATP.
B
Each stage produces ATP, but only the third stage occurs in the mitochondria.
C
Each stage produces ATP, but only the first stage occurs in the cytoplasm.
D
Each stage occurs in the cytoplasm, but only the final stage produces ATP.

Explanation

Glycolysis, the first stage, takes place in the cytoplasm and produces a small amount of ATP. The Krebs cycle and electron transport chain take place in the mitochondria, and both also produce ATP. Therefore, each stage produces ATP, but only the first occurs in the cytoplasm: choice C.

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