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
To determine the correct order of events occurring in the light reactions, you need to understand the sequence of events involved in the process. Here's how you can organize the given statements in the correct order:
1. Start with the statement you already know is correct: "Photons of light with a wavelength of 680nm enter the chloroplast."
2. Look for statements that mention the "energized electrons" and their movement through various membrane proteins. Based on this, the correct sequence is as follows:
- Statement 4 should come next: "A photon of light splits water, and electrons enter PSII."
- Statement 5 follows: "Electrons energized at PSII jump to a higher level, and as they fall through various membrane proteins, H+ is pumped from the stroma to the lumen."
- Statement 2: "Electrons re-energized by PSI jump to a high energy level, and as they fall through various membrane proteins, H+ is pumped from the stroma to the lumen."
3. Now, let's consider the remaining statements. These involve the actions of H+ ions and the formation of ATP and NADPH:
- Statement 3: "Low-energy electrons at PSI are re-energized by a photon of light."
- Statement 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."
- Statement 8: "H+ pumped into the lumen by electrons energized at PSII diffuse through ATP synthase, making ATP."
4. Finally, we have one statement left: "ATP and NADPH head to the stroma to be used in the Calvin cycle." This statement indicates the movement of ATP and NADPH from the thylakoid membrane to the stroma and is the last step in the light reactions.
So, the correct order of events occurring in the light reactions, based on the statements provided, is:
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, and as they fall through various membrane proteins, H+ is pumped from the stroma to the lumen.
2 - Electrons re-energized by PSI jump to a high energy level, and as they fall through various membrane proteins, 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, and the electrons at the end of the chain are donated to NADP+ to make NADPH.
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.