Where does glycolysis occur in a cell?

• A. In the mitochondria
• B. In the cytosol
• C. In the nucleus
• D. In the chloroplast

Answer: (B)

Glycolysis occurs in the cytosol because it is a soluble, cytoplasmic pathway that converts glucose to pyruvate using enzymes that operate in the aqueous interior of the cell. This setup allows glycolysis to generate ATP and NADH without needing membrane-bound compartments, and it functions in both prokaryotes and eukaryotes. In eukaryotic cells, the subsequent steps of cellular respiration take place in mitochondria, but glycolysis itself is confined to the cytosol. Chloroplasts handle photosynthesis, the nucleus houses genetic material, and they are not the sites where the glycolytic enzymes operate.