Understanding Cellular Respiration

Understanding Cellular Respiration

Cellular respiration is how cells convert the energy stored in glucose into ATP. For VCE Biology, you’ll usually need to explain each stage, identify where it happens in the cell, and describe how energy is released and captured.

Big picture: the process is often summarised as breaking down glucose into smaller molecules, then transferring energy to electron carriers, and finally using that energy to produce ATP.

Key Stages

• Glycolysis: occurs in the cytoplasm and breaks glucose into pyruvate.
• Krebs Cycle: occurs in the mitochondrial matrix and extracts more energy, producing electron carriers and a small amount of ATP.
• Electron Transport Chain: occurs on the inner mitochondrial membrane and uses electrons to generate a proton gradient.

Exam Tips

• Practice drawing the “flow” of carbon and electrons through each stage.
• When asked “where,” anchor your answer to the correct cellular location.
• Use cause-and-effect language: e.g., electron transport creates a gradient, which drives ATP synthesis.