Refer to the Table Below

question 91

Multiple Choice

Refer to the table below. Data in the table summarize a set of experiments in which a plant species was treated with plain water or with additions of compound X or compound Y to its daily waterings.After 7 days of treatment, chloroplasts from the plants were isolated, and their abilities to carry out water oxidation, ATP production, and NADP⁺ reduction were measured.The number of "+" symbols is proportional to the level of biological activity observed.Both cyclic and noncyclic photophosphorylation processes are active in this plant species.Which hypothesis concerning the mode of action of compounds X and Y is consistent with the data?

• A) Compound X and compound Y are both inhibitors of ATP synthase.
• B) Compound X and compound Y are both inhibitors of NADP⁺ reductase.
• C) Compound X is an NADP⁺ reductase inhibitor, and compound Y causes protons to leak through the thylakoid membrane.
• D) Compound X causes protons to leak through the thylakoid membrane, and compound Y is an ATP synthase inhibitor.
• E) Compound X is an ATP synthase inhibitor, and compound Y causes protons to leak through the thylakoid membrane.

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