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The space enclosed by the inner mitochondrial membrane is the

  • A.thylakoid lumen
  • B.matrix
  • C.intermembrane space
  • D.stroma

Answer: B

Correct answer: matrix

The matrix is the compartment inside the inner membrane, and it holds the enzymes of the citric acid cycle and of fatty acid oxidation, along with the mitochondrial DNA and its ribosomes. The intermembrane space lies between the two membranes and is where protons accumulate; the stroma and thylakoid lumen are the corresponding chloroplast compartments.

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