The enzyme RuBisCO is involved in which of the following processes?

• A. Carbon fixation in the Calvin cycle
• B. Electron transport in the thylakoid membrane
• C. Photolysis of water in the light reactions
• D. ATP synthesis in the chloroplast stroma

Answer: (A)

Verified step by step guidance

1. Understand the role of RuBisCO: RuBisCO is an enzyme that catalyzes the first major step of carbon fixation in the Calvin cycle, which is part of photosynthesis.
2. Identify the process RuBisCO is involved in: Carbon fixation is the process where carbon dioxide is converted into organic compounds, and RuBisCO facilitates this by catalyzing the reaction between carbon dioxide and ribulose bisphosphate.
3. Differentiate between the processes: Electron transport in the thylakoid membrane, photolysis of water, and ATP synthesis are all parts of the light-dependent reactions of photosynthesis, whereas RuBisCO functions in the light-independent reactions (Calvin cycle).
4. Recognize the location of RuBisCO activity: RuBisCO operates in the stroma of the chloroplast, where the Calvin cycle takes place, distinct from the thylakoid membrane where light-dependent reactions occur.
5. Conclude the correct association: Based on the understanding of RuBisCO's function and location, it is involved in carbon fixation during the Calvin cycle, not in the other processes listed.