In eukaryotic cells, where does glycolysis occur relative to the mitochondria?

• A. In the mitochondrial matrix
• B. In the intermembrane space of the mitochondria
• C. On the inner mitochondrial membrane
• D. In the cytosol (cytoplasm), outside the mitochondria

Answer: (D)

Verified step by step guidance

1. Recall the cellular location of glycolysis in eukaryotic cells: glycolysis is the metabolic pathway that breaks down glucose into pyruvate.
2. Understand that glycolysis occurs in the cytosol, which is the fluid portion of the cytoplasm outside the mitochondria.
3. Recognize that the mitochondria have distinct compartments: the outer membrane, intermembrane space, inner membrane, and matrix.
4. Note that glycolysis does not take place inside any mitochondrial compartment such as the matrix, intermembrane space, or on the inner membrane.
5. Conclude that glycolysis occurs in the cytosol, outside the mitochondria, before pyruvate enters the mitochondria for further processing.