Photosynthesis Review Questions

1. What is the primary function of photosynthesis?

2. (A) Name a gas released as by-product of the light dependent reactions of photosynthesis.

(B) Name the molecule that is the source of this gas. (

C) Why is oxygen removed from the molecule named in 2B?

3. Name two molecules that are produced during the light dependent reactions of photosynthesis and serve as temporary sites for energy storage.

4. (A) When a molecule loses an electron, the molecule has been _?_ (oxidized or reduced or destroyed

(B) When a molecule gains an electron, the molecule has _?_ (gained energy or lost energy)

5. When chlorophyll P680 absorbs sunlight, what subatomic particle actually has a change in energy content? (electron or proton or neutron)

6. (A) When chlorophyll P680 loses an electron, from what atom does the chlorophyll receive an electron?

(B) When chlorophyll P680 loses an electron, from what molecule does the chlorophyll receive an electron?

7. Which contains more energy: one molecule of NADP or one molecule of NADP-H ?

8. What is the name of the three carbon molecule that is a product of the Calvin cycle (= “dark” reactions)?

9. Name the molecule that is taken from the air and that provides the carbon for the production of carbohydrates during the Calvin cycle.

10. Which has the most energy: one photon of green light, one photon of red light, or one photon of blue light ?

11. Chlorophyll is green because it _?_ (absorbs, reflects, or transmits) green wave lengths of light.

12. In eukaryotic cells, photosynthesis occurs in organelles named _?_

13. The term phosphorylation means:

14. True or False: The Calvin cycle can occur in a plant that is in dark room so long as the materials carbon dioxide, ATP, and NADP-H are present.

15. "Packets" or "particles" of light are called ?

16. Summarize, in one sentence, what happens during the light dependent reactions of photosynthesis.

17. Summarize, in one sentence, what happens during the light independent reactions of photosynthesis.

18. What happens to an electron in chlorophyll in Photosystem II when the electron absorbs light energy?

19. High energy electrons in Photosystem I are used to manufacture molecules of ?

20. High energy electrons in Photosystem II are used to manufacture molecules of ?