| Coverage : The Photosynthesis Quiz II tests your knowledge about the photosystems involved in the light-dependent reactions of photosynthesis. |
| 1. | Where are the photosystems located in photosynthetic plants? |
| a. | | Free floating in the stroma |
| b. | | Embedded in the thylakoid membrane |
| c. | | Linked to the outside of the grana |
| d. | | Linked to the outside of the cell wall |
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| 2. | What is the order of events for the light-dependent reactions? |
| a. | | Stroma absorb sunlight, ATP and NADPH formation, electrons replaced in pigments |
| b. | | Protons added to pigments, pigments absorb sunlight, ATP and NADPH formation |
| c. | | ATP and NADPH formation, pigments absorb sunlight, electrons replaced in pigments |
| d. | | Pigments absorb sunlight, ATP and NADPH formation, electrons replaced in pigments |
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| 3. | Which of the following statements are true about photosystems? |
| a. | | Each has a reaction center |
| b. | | A membrane may have thousands of them |
| c. | | Each contains 200 to 300 pigment molecules |
| d. | | They can absorb a photon |
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| 4. | The molecule that traps the excitation energy and gives up electrons for photosynthesis is called: |
| a. | | Chlorophyll a |
| b. | | Photon distributor |
| c. | | Reaction center |
| d. | | Photosystem electron acceptor |
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| 5. | Which statement(s) best describe(s) an electron transport system (ETS)? |
| a. | | A unidirectional chain of enzymes and coenzymes that can pass electrons one way |
| b. | | A bidirectional chain of enzymes and coenzymes that can pass electrons either way |
| c. | | A free-floating soup of enzymes, coenzymes, and cofactors in the cytoplasm |
| d. | | An organized, sequential array of enzymes, coenzymes, and proteins in a cell membrane |
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| 6. | What does the term "cyclic" mean in reference to photosystem I? |
| a. | | Electrons are passed in circles around the reaction center until they hit it |
| b. | | The photons of light circle through the grana until they find a reaction center |
| c. | | Once the ATP formation has been done by the ETS the electron returns to PS I |
| d. | | The electron that started by the splitting of water is made back into water |
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| 7. | Photosystems I and II sometimes "swap" their reaction centers. |
| a. | | True |
| b. | | False |
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| 8. | Which of the following are true about photosystem II? |
| a. | | It begins the non-cyclic pathway of ATP synthesis |
| b. | | It has P680 as its reaction center |
| c. | | It replaces its lost electron through photolysis of water |
| d. | | It is the site of NADH formation |
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| 9. | The excited electrons from photosystem II get even more excited in photosystem I because of the photons bombarding the P700 reaction center. |
| a. | | True |
| b. | | False |
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| 10. | If you see bubbles coming off of underwater plants, what are you seeing? |
| a. | | Oxygen bubbles from reactions in photosystem I |
| b. | | Oxygen bubbles from reactions in photosystem II |
| c. | | Oxygen bubbles from reactions in the non-cyclic pathway of photosynthesis |
| d. | | Oxygen bubbles from photolysis |
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| 11. | Why are electron transport systems important in photosynthesis? |
| a. | | They reduce NADP+ to NADPH for later reducing power in syntheses |
| b. | | They reduce NAD+ to NADH for later reducing power in syntheses |
| c. | | They convert ATP into ADP which provides a store of energy |
| d. | | They convert ADP into ATP which provides a store of energy |
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| 12. | Which of the following is(are) not true? |
| a. | | Excited electrons from PSII are higher in energy than excited electrons from PSI |
| b. | | Excited electrons from photolysis are higher in energy than excited electrons from PSI |
| c. | | Excited electrons from PSI are higher in energy than excited electrons from PSII |
| d. | | Electrons are higher in energy before they enter the ETS than after they leave it |
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