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Photosynthesis steps
Light Dependent Reactions and Calvin Cycle
| Question | Answer |
|---|---|
| Step 1 of Light Reactions | Sunlight hits chlorophyll molecules exciting electrons. |
| Step 2 of Light Reactions | Electrons from photosystem 1 move down an electron transport chain and get added to NADP+ to make NADPH. |
| Step 3 of Light Reactions | Electrons from Photosystem 2 move down another electron transport chain, pumping H+ ions into the thylakoid lumen, and replacing the lost electrons from Photosystem 1. |
| Step 4 of Light Reactions | Water is split by light producing 2 electrons, 2 hydrogen ions, and oxygen. The electrons replace those lost in photosystem 2, the oxygen leaves as waste, the hydrogen stays in the lumen. |
| Step 5 of Light Reactions | H+ ions move out of the lumen through ATP synthase. The energy of that movement helps ATP synthase produce ATP from ADP molecules. |
| Step 6 of Light Reactions | Both ATP and NADPH head to the stroma to be used in the Calvin Cycle. |
| Step 1 of Calvin Cycle | 3 molecules of Carbon Dioxide are added to three 5-carbon molecules of RuBP to produce six 3-carbon molecules of 3PG. |
| Step 2 of Calvin Cycle | the six 3PG molecules get energy from ATP and NADPH and turn into six molecules of G3P. |
| Step 3 of Calvin Cycle | One of the G3P's leaves the Calvin cycle to join with another G3P to produce glucose. |
| Step 4 of Calvin Cycle | the five remaining G3P's get energy from ATP and rearrange back into the 3 RuBP molecules we started with. |