NADPH is generated during the ________ reactions, only through _____
electron flow.

Question

BlackTom AI · Accepted Answer

Let's parse the question and the answer options carefully to understand what NADPH is associated with. 
Option 1: 'light; cyclic' The cyclic electron flow around photosystem I produces ATP mainly, and does not generate NADPH. If NADPH were produced here, this option would be correct, but it isn’t, so this choice is inaccurate. 
Option 2: 'dark; non-cyclic' The dark reactions (Calvin cycle) utilize NADPH produced by light reactions, but NADPH itself is not generated during the dark reactions. The statement misplaces NADPH production in the dark phase, making this option false. 
Option 3: 'light; non-cyclic' This matches the established biology: during the light reactions of photosynthesis, the non-cyclic electron flow (Z-scheme) transfers electrons and results in the production of both ATP and NADPH. Since NADPH is generated specifically in the non-cyclic pathway, this option correctly ties light-driven activity to NADPH formation. 
Option 4: 'dark; cyclic' The dark reactions do not generate NADPH and cyclic flow does not produce NADPH either; cyclic flow primarily regenerates ATP without NADPH production. Therefore, this option is incorrect. 
In summary, understanding the distinction between cyclic and non-cyclic electron flow clarifies why NADPH is produced during the light-driven, non-cyclic pathway rather than during cyclic flow or during the dark reactions.

APBIO141-031 with labs Unit 3 Test

NADPH is generated during the ____ reactions, only through _ electron flow.

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