Name: ____________________________________________ Date: _________________ Period: _____
POGIL Biology XII – Photosynthesis: Capturing light and using it to produce ATP
and reducing power the light reactions)
Photosynthesis is the process of collecting electromagnetic radiation in the visible range and
converting it into chemical energy, which is then used to convert atmospheric carbon dioxide
into intracellular sugars that can be used either in glycolysis or in biosynthetic pathways that
produce all of the macromolecules required by the plant cell.
.
Model 1 – The light and the chloroplast
Written by Dr. Joe Corsi of Eastern Oregon University. Accessed from http://www.eou.edu/~jcorsini/.
Name: ____________________________________________ Date: _________________ Period: _____
Model 2 –Capturing light energy
Model 3 – Converting light energy to ATP and NADPH (reducing power)
Written by Dr. Joe Corsi of Eastern Oregon University. Accessed from http://www.eou.edu/~jcorsini/.
Name: ____________________________________________ Date: _________________ Period: _____
Using the diagrams above, your textbook, and your note set, answer the following questions.
1. In model 1, where in the chloroplast does chlorophyll reside? Is there really just one
molecule of chlorophyll per chloroplast?
2. In model 1, what occurs to carbon dioxide?
3. In model 1, what is produced during the light reactions? The dark reactions?
4. In model 1, why is the photon shown striking the chlorophyll molecule?
5. Place these events in the correct order: absorbtion of electromagnetic radiation by
chlorophyll, synthesis of sugars, utilization of carbon dioxide by Calvin cycle enzymes,
synthesis of NADPH, synthesis of ATP, conversion of water into molecular oxygen.
6. In model 2, what are the green polygons with little tails?
7. In model 2, what does the bent arrow represent?
Written by Dr. Joe Corsi of Eastern Oregon University. Accessed from http://www.eou.edu/~jcorsini/.
Name: ____________________________________________ Date: _________________ Period: _____
8. In model 2, why does the bent arrow pass through several of the green polygons?
9. In model 2, what does the symbol e- stand for? Which molecule does the e- come from?
Where does it end up?
10. What is the role of water in the light gathering reactions of photosynthesis?
11. What is the name of the electron acceptor in model 2? Where is it located, and what does
it do with the electron?
12. In model 2, the reaction chlorophyll is now short one electron. How is this electron void
replenished?
13. In model 3, what are the photosystems composed of? What are P680 and P700?
Written by Dr. Joe Corsi of Eastern Oregon University. Accessed from http://www.eou.edu/~jcorsini/.
Name: ____________________________________________ Date: _________________ Period: _____
14. Distinguish between cyclic and non-cyclic electron transport. Which part of model 3
shows which part shows non-cyclic e- transport?
15. In model 3, is NADP+ oxidized or reduced? How do you know this?
16. What would you expect to happen if you inactivated the NADP reductase?
17. Cyclic electron transport is not shown in model 3. What path do the electrons take during
cyclic electron transport? Why is it referred to as ‘cyclic’
Written by Dr. Joe Corsi of Eastern Oregon University. Accessed from http://www.eou.edu/~jcorsini/.