AP Bio Unit 3.2 Quiz: Photosynthesis

1. 1. Read the statements below regarding photosystems. Which statement does not accurately describe their functions? (3.5)

• A. Both photosystem I and photosystem II contain pigment molecules that capture light.

• B. Inside the reaction center, electrons are excited by solar energy and then pass to electron acceptor molecules.

• C. Photosystem I is closely associated with molecules that aid in the splitting of water.

• D. The flow of electrons goes from photosystem II to photosystem I.

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2. 2. Which of the following represents both a product of the light reactions and a reactant in the Calvin cycle? Choose all that apply.

• A. ATP

• B. ADP + Pi

• C. NADPH

• D. NADP+

3. 3. Photoprotection is a process that helps organisms mitigate the damaging effects of the sun. In plants, which pigment plays a central role in this process of photoprotection?

• A. Chlorophyll a

• B. Chlorophyll b

• C. Carotenoids

• D. Flavonoids

4. 4. Which statement best explains how the electron transport chain (ETC) functions in the light-dependent reactions of photosynthesis?

• A. The ETC transports electrons to the Calvin cycle to power sugar synthesis.

• B. The ETC uses the energy from excited electrons to pump protons across the thylakoid membrane, creating a proton gradient.

• C. The ETC is responsible for splitting water molecules to release oxygen.

• D. The ETC transfers electrons directly to ATP synthase, facilitating ATP production.

5. 5. Why is chlorophyll a critical pigment in the light-dependent reactions of photosynthesis?

• A. It directly captures carbon dioxide for the Calvin cycle.

• B. It absorbs light energy and transfers excited electrons to the electron transport chain.

• C. It is responsible for the synthesis of ATP from ADP and inorganic phosphate.

• D. It acts as the primary electron donor in the Calvin cycle.

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6. 6. Which of the following best describes the role of the proton gradient in photosynthesis?

• A. It drives the splitting of water molecules in Photosystem II.

• B. It powers the synthesis of ATP via ATP synthase as protons flow back across the thylakoid membrane.

• C. It facilitates the transfer of electrons from Photosystem II to Photosystem I.

• D. It is responsible for reducing NADP+ to NADPH in the stroma.

7a. Identify the primary functions of the Calvin Cycle in photosynthesis.

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7b. Describe the role of Rubisco in photosynthesis and explain why its interaction with oxygen is considered wasteful.

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7c. Explain how the introduction of carboxysomes into C3 plants could enhance photosynthetic efficiency.

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7d. Discuss one potential environmental or ecological impact of introducing genetically engineered carboxysomes into crop plants.

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