Answer: Krebs cycle enzymes, mitochondrial DNA, and ribosomes.
- A The cytochrome electron transport chain embedded along the cristae membrane
- B Krebs cycle enzymes, mitochondrial DNA, and ribosomes
- C Free water with no dissolved enzymes or genetic material whatsoever
- D ATP synthase complexes alone, projecting from the inner membrane surface
Correct answer: B. Krebs cycle enzymes, mitochondrial DNA, and ribosomes
Explanation: Mitochondrial matrix contains Krebs cycle enzymes, circular mitochondrial DNA, 70S ribosomes, and other soluble components.
Animal cell structure with major organelles labeled. Image: LadyofHats (Mariana Ruiz), Public Domain, via Wikimedia Commons.
Concept context
Cell theory, prokaryotic vs eukaryotic cells, organelles and their functions. Foundation of all biology.