Is this right: Place numbers beside the statement below to indicate the order of events occurring in the light reactions:
3 low energy electrons at PSI are re-energized by a photon of light
5 electrons energized at PSII jump to a higher lever, as they fall through various membrane proteins H+ is pumped from the stroma to the lumen
1 photons of light with a wavelength of 680nm enter the chloroplast (this is the only one I know is correct)
6 H+ pumped with the energy of electrons from PSI diffuses through ATP synthase making ATP and the electrons at the end of the chain are donated to NADP+ to make NADPH
4 A photon of light splits water and electrons enter PSII
2 electrons re-energized by PSI jump to a high energy level, as they fall through various membran proteins, H+ is pumped from the stroma to the lumen
8 H+ pumped into the lumen by electrons energized at PSII diffuse through ATP synthase making ATP
7 ATP and NADPH head to the stroma to be used in the Calvin cycle
THANKS! I AM FOREVER GRATEFUL!
Looking back I am pretty sure these numbers are wrong, I think I have the right ones now, so don't anyone use these!
To determine the correct order of events occurring in the light reactions, you can analyze the statements and compare them to the steps of the light reactions in photosynthesis. Here's an explanation of how you can order the events:
1. Start by identifying any statements that explicitly mention a certain step of the light reactions. In this case, you correctly identified that statement 1 refers to the entry of photons of light into the chloroplast, which is the first step.
2. Now focus on the statements that involve the movement of electrons and the pumping of protons (H+ ions). The process of electron movement and proton pumping occurs in two photosystems: PSII and PSI.
- Statement 4 mentions the splitting of water, which occurs in PSII and supplies electrons to the electron transport chain. This indicates that statement 4 happens before the events related to PSI.
- Statement 5 refers to the energized electrons at PSII jumping to a higher energy level and the pumping of H+ ions. This suggests that statement 5 occurs after the splitting of water (statement 4) and represents events in PSII.
- Statement 2 also mentions electrons being re-energized by PSI and the pumping of H+ ions. Since PSI operates after PSII, statement 2 comes after statement 5.
3. We can now adjust the order accordingly:
1. Photons of light with a wavelength of 680nm enter the chloroplast.
4. A photon of light splits water, and electrons enter PSII.
5. Electrons energized at PSII jump to a higher level, while H+ is pumped from the stroma to the lumen.
2. Electrons re-energized by PSI jump to a high energy level, as they fall through various membrane proteins. Simultaneously, H+ is pumped from the stroma to the lumen.
3. Low energy electrons at PSI are re-energized by a photon of light.
6. H+ pumped with the energy of electrons from PSI diffuses through ATP synthase, making ATP. The electrons at the end of the chain are donated to NADP+ to make NADPH.
8. H+ ions pumped into the lumen by electrons energized at PSII diffuse through ATP synthase, making ATP.
7. ATP and NADPH head to the stroma to be used in the Calvin cycle.
By following this analysis, the correct order of events occurring in the light reactions is provided above.