Final answer:
The intermembrane space and the matrix of a mitochondrion differ significantly, where the matrix hosts the Krebs cycle and the inner membrane is where oxidative phosphorylation occurs. The correct answer is c.
Step-by-step explanation:
The intermembrane space and the matrix are two distinct compartments within a mitochondrion, each with specific functions important for cellular respiration. The intermembrane space is the area between the inner and outer mitochondrial membranes, while the matrix is the central part enclosed by the inner membrane.
The statement that both contain high concentrations of ATP is incorrect. ATP is primarily synthesized on the inner membrane and mostly present within the matrix or exported out of the mitochondrion into the cytoplasm where it is used as energy currency for the cell. Therefore, we may find some ATP within the intermembrane space during transport, but it's not characterized by a high concentration of ATP like the matrix.
The assertion that the matrix is the site of oxidative phosphorylation is misleading. The matrix contains enzymes for the Krebs cycle and parts of the fatty acid oxidation process, but the oxidative phosphorylation process takes place along the inner mitochondrial membrane where the electron transport chain and ATP synthase are located.
Lastly, the idea that both compartments are filled with ribosomes is inaccurate. Mitochondrial ribosomes are indeed found within the matrix, where mitochondrial DNA is also present, supporting the synthesis of some mitochondrial proteins. However, the intermembrane space is not known to contain ribosomes.
In summary, it is crucial to recognize the distinct roles and characteristics of the intermembrane space and the matrix of a mitochondrion to fully understand how cellular respiration and ATP synthesis occur.