1. The problem statement, all variables and given/known data An illuminated suspension of chloroplasts is actively carrying out photosynthesis. What would happen to the levels of 3-phosphoglycerate and Ribulose 1,5-Bisphosphate if the light was suddenly switched off? 2. Relevant equations 3. The attempt at a solution I thought that the answer would be that the levels of 3-phosphoglycerate and Ribulose 1,5-Bisphosphate would decrease because the CO2 that is fed into the Calvin Cycle to make these compounds comes from the light-dependent reactions. Also, 3 of the enzymes in the stroma that regulate the Calvin Cycle are light-dependent as well. However, someone told me that the 3-phosphoglycerate levels would increase instead. I was wondering if someone could please tell me why this would happen? Thanks in advance!