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Multiple Choice
Which of the following is not a step in the light-dependent reactions of photosynthesis?
A
Carbon fixation
B
Photolysis of water
C
ATP synthesis
D
Electron transport chain
Verified step by step guidance
1
Understand the context: The light-dependent reactions of photosynthesis occur in the thylakoid membranes of chloroplasts and involve the conversion of light energy into chemical energy.
Identify the key processes: The main steps in the light-dependent reactions include photolysis of water, ATP synthesis, and the electron transport chain.
Clarify each process: Photolysis of water involves splitting water molecules to release oxygen, protons, and electrons. ATP synthesis occurs through photophosphorylation, where ATP is generated from ADP and inorganic phosphate. The electron transport chain involves the transfer of electrons through a series of proteins embedded in the thylakoid membrane.
Define carbon fixation: Carbon fixation is a process that occurs in the Calvin cycle, which is part of the light-independent reactions of photosynthesis. It involves the incorporation of carbon dioxide into organic molecules.
Determine the outlier: Since carbon fixation is part of the light-independent reactions and not the light-dependent reactions, it is not a step in the light-dependent reactions of photosynthesis.