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Light-dependent reactions Transitional Reasoning Practice

Biology · Cellular Energetics · Biology · Photosynthesis

1 Biology practice questions on Light-dependent reactions. Questions that build towards applied reasoning.

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  1. 1.

    An investigator isolates intact thylakoid membranes and suspends them in an illuminated, buffered medium containing ADP, inorganic phosphate, and NADP+. The investigator then introduces a chemical compound that selectively allows protons to diffuse freely across the thylakoid membrane without directly inhibiting any electron carrier complexes. Which of the following describes the most likely effect of this treatment on the products of the light-dependent reactions?

    • A) Oxygen evolution and NADPH formation continue, whereas ATP synthesis is severely diminished.
    • B) ATP synthesis remains unaffected, whereas the formation of both oxygen and NADPH is completely inhibited.
    • C) Oxygen evolution stops immediately, whereas ATP and NADPH synthesis continue via cyclic photophosphorylation.
    • D) The synthesis of ATP, NADPH, and oxygen are all completely arrested due to the disruption of electron transport.

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