Compare and contrast the structure of mitochondria and chloroplasts. Explain 2 similarities in structure, and two differences in structure. Predict what would happen to photosynthesis, if you increased the pH (lowered the H+ concentration) inside the thylakoids. Which photosystem is required for producing oxygen and exactly where in a chloroplast is it located? Explain why the Dark Reaction (Calvin Cycle) depends on the Light Reaction. In your answer describe which molecules are required.