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BIO NMDCAT Cytoplasmic Organelles
nmdcat.online July 4, 2026

63. The spatial location of the enzymes responsible for catalyzing the steps of the tricarboxylic acid (Krebs) cycle within the mitochondrion is the

A. Outer membrane surface
B. Intermembrane space fluid
C. Inner membrane foldings
D. Matrix space
✓

📝 Explanation

The soluble enzymes of the Krebs cycle reside inside the fluid matrix, with the sole exception of succinate dehydrogenase (bound to the inner membrane).

📖 Additional Information

  • Outer membrane surface
  • Intermembrane space fluid
  • Inner membrane foldings
  • Matrix space

The soluble enzymes of the Krebs cycle reside inside the fluid matrix, with the sole exception of succinate dehydrogenase (bound to the inner membrane).

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