8.2: The Light Reactions Convert Solar Energy to the Chemical Energy of ATP and NADPH
Key Terms: Wavelength, Electromagnetic Spectrum, Visible Light, Photons, Spectrophotometer, Absorption Spectrum, Chlorophyll A, Chlorophyll B, Action Spectrum, Carotenoids, Photosystem, Reaction-Center Complex, Light-Harvestin Complex, Primary Electron Acceptor, Photosystem II, Photosystem I, Linear Electron Flow,
BELLWORK: Watch and take your own notes on the Conceptual Overview of Light Dependent Reactions Khan Academy video
IN CLASS READING of Concept 8.2: Pages 165-172 in your text.
From page 166:
1. Compare the amount of energy in violet light to red light.
2. List 3 things that can happen to light when it meets matter.
3. State whether pigments absorb, reflect, or transmit light.
4. Explain why we see green when we look at a leaf.
5. Draw the Absorption spectra of Chlorophyll a, Chlorophyll b, and Carotenoids (see fig 8.9 on page 167)
6. Explain what the absorption spectrum of chlorophyll a suggests about which color light works best for photosynthesis.
7. Explain how the action spectrum for photosynthesis confirms what you explained in objective 6.
8. Predict what color of light would be least effective for driving photosynthesis.
From page 167 and 168
9. Explain why the action spectrum for photosynthesis is broader than the absorption spectrum of chlorophyll a by itself.
From page 168
10. Describe another role for carotenoids in both plants and humans.
11. Using the terms 'ground state' and 'excited state', explain what happens when a molecule absorbs a photon of light.
12. Explain why electrons can't stay in the excited state.
From page 169
13. Describe what some pigments, including chlorophyll, do after absorbing photons.
14. Create a flow chart that summarizes how a photosystem harvests light. (see fig 8.12a)
15. Compare what happens to the potential energy represented by an excited electron when a primary electron acceptor is present to what happens in isolated chlorophyll when a primary electron acceptor is not present.
From page 170
16. List the 2 photosystems found in the thylakoid membrane, circling the one that functions first in the light reactions.
From page 171
17. Draw an analogy for linear electron flow during the light reactions. (see fig 8.14)
18. Restate the "big picture" purpose of the light reactions.
19. State what chloroplasts and mitochondria have in common when it comes to ATP production.
20. Compare the source of high energy electrons in chloroplasts to the source of high energy electrons in mitochondria.
From page 172
21. Summarize how mitochondria and chloroplasts use chemiosmosis differently.
22. Explain how simply measuring the pH in the thylakoid space and the stroma when lights are on or off provides strong evidence in support of chemiosmosis.
23. Summarize the light reactions.
24. State the initial electron donor in the light reactions, and state the location of those electrons at the end of the light reactions.
25. In an experiment, isolated chloroplasts placed in an illuminated solution with the appropriate chemicals can carry out ATP synthesis. Predict what would happen to the rate of synthesis if a compound is added to the solution that makes membranes freely permeable to hydrogen ions.
2. List 3 things that can happen to light when it meets matter.
3. State whether pigments absorb, reflect, or transmit light.
4. Explain why we see green when we look at a leaf.
5. Draw the Absorption spectra of Chlorophyll a, Chlorophyll b, and Carotenoids (see fig 8.9 on page 167)
6. Explain what the absorption spectrum of chlorophyll a suggests about which color light works best for photosynthesis.
7. Explain how the action spectrum for photosynthesis confirms what you explained in objective 6.
8. Predict what color of light would be least effective for driving photosynthesis.
From page 167 and 168
9. Explain why the action spectrum for photosynthesis is broader than the absorption spectrum of chlorophyll a by itself.
From page 168
10. Describe another role for carotenoids in both plants and humans.
11. Using the terms 'ground state' and 'excited state', explain what happens when a molecule absorbs a photon of light.
12. Explain why electrons can't stay in the excited state.
From page 169
13. Describe what some pigments, including chlorophyll, do after absorbing photons.
14. Create a flow chart that summarizes how a photosystem harvests light. (see fig 8.12a)
15. Compare what happens to the potential energy represented by an excited electron when a primary electron acceptor is present to what happens in isolated chlorophyll when a primary electron acceptor is not present.
From page 170
16. List the 2 photosystems found in the thylakoid membrane, circling the one that functions first in the light reactions.
From page 171
17. Draw an analogy for linear electron flow during the light reactions. (see fig 8.14)
18. Restate the "big picture" purpose of the light reactions.
19. State what chloroplasts and mitochondria have in common when it comes to ATP production.
20. Compare the source of high energy electrons in chloroplasts to the source of high energy electrons in mitochondria.
From page 172
21. Summarize how mitochondria and chloroplasts use chemiosmosis differently.
22. Explain how simply measuring the pH in the thylakoid space and the stroma when lights are on or off provides strong evidence in support of chemiosmosis.
23. Summarize the light reactions.
24. State the initial electron donor in the light reactions, and state the location of those electrons at the end of the light reactions.
25. In an experiment, isolated chloroplasts placed in an illuminated solution with the appropriate chemicals can carry out ATP synthesis. Predict what would happen to the rate of synthesis if a compound is added to the solution that makes membranes freely permeable to hydrogen ions.
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