Metabolism and Photosynthesis Chapters 6 & 7 Autotrophs Chloroplasts ? Contain chlorophyll ? Green ? Site of photosynthesis ? Concentrated in leaves Chloroplast Structure Overview of Photosynthesis ? Light Reaction (stage 1) ? Occurs in thylakoid membranes of granna ? Converts light energy to chemical energy ? O2 produced as waste product ? Calvin Cycle (stage 2) ?Melvin Calvin ? Occurs in stroma of chloroplasts ? Synthesizes sugar molecules with CO2 & energy produced in light reactions ? The light reactions ? Convert light energy to chemical energy and produce O2 ? The Calvin cycle assembles sugar molecules from CO2 ? Using ATP and NADPH from the light reactions Figure 7.5 Light CO2H2O Chloroplast LIGHT REACTIONS (in thylakoids) CALVIN CYCLE