(Note: If a plant cell ONLY wants to make ATP, it can recycle the electrons that have used their energy to pump protons back to PS II. This is called Cyclic Photophosphorylation)

F. The energy depleted electrons now reach Photosystem I (PS I). PS I boosts the energy level in the electrons even higher and they are passed down a 2nd electron transport chain (also made of cytochromes) and eventually make their way onto NADPH (accepts electrons).

 




Equation: (NADP+) + (H+) + (2e-) = NADPH
(2 excited electrons)

VII. Light Independent Reactions-The Calvin Cycle-building Glucose. Also known as C3 Photosynthesis. Happens in the stroma of the chloroplasts (inside outer membrane, outside of the thylakoid)

Takes six turns of the cycle to make one molecule of glucose