IB skill practice

Analyse respiration pathways and energy yield

Paper 1, Paper 2 5 marks Difficulty 4

Explain oxidative phosphorylation

A mitochondrion diagram in a Melbourne HL genetics workshop shows protons pumped into the intermembrane space and ATP synthase in the inner membrane. Explain how ATP is produced. Enter the answer and choose the interpretation that best matches the HL Biology evidence.

Worked practice: biological evidence and answer

Use the labelled biological evidence first, then connect it to the final answer.