Critical Thinking

6. Making Comparisons Thinking about the main role of pigments in photosynthesis, explain how the pigments in colored objects such as clothes differ from plant pigments.

7. Analyzing Information The molecule that precedes the electron transport chains of both photosystem I and photosystem II is an electron acceptor. What is the original molecule that is the electron donor for both of these systems?

8. Predicting Results Explain how the light reactions would be affected if there were no concentration gradient of protons across the thylakoid membrane.

Science in Action

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