1. The Calvin Cycle Photosynthesis

2. Calvin Cycle

3. Calvin Cycle Overview Calvin cycle is a cyclical process which: 1.Fixes carbon (make C-C bonds) 2.Utilizes energy molecules 3.Regenerates molecules for another cycle

4. Calvin Cycle occurs in the stroma of chloroplast reactions are not as linear as Krebs

5. Calvin Cycle: Carbon Fixation 1.three CO 2 (1 carbon) are attached to three 1,5- ribulose bisphosphate (5 carbon) 2.three 6-carbon molecule are split into six 3- carbon molecules rxn type: synthesis & cleavage enzyme: synthase &lyase (Rubisco)

6. Rubisco ribulose bisphosphate carboxylase / oxygenase large, slow reacting enzyme – most enzymes process 1000 reactions / second – rubisco processes 3 reactions / second plants need large amounts of rubisco for Calvin cycle – half the protein in a leaf – most abundant protein on Earth