The reactions of the Krebs cycle take place in the

  • A. cytoplasm
  • B. outer membrane of the mitochondrion
  • C. intermembrane space
  • D. matrix of the mitochondrion

Explanation

The soluble enzymes of the cycle sit in the mitochondrial matrix, while the electron transport chain that the cycle feeds is embedded in the inner membrane. Glycolysis alone happens outside the mitochondrion in the cytoplasm.

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