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For photophosphorylation to take place, it ALWAYS requires the following: (a) H₂O (b) H* gradient (c) oxygen (d) NADP+ (e) all of them

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Answer: (b) H* gradient

Explanation: The aforementioned gradient is effectively utilized by ATP synthase in the process of producing adenosine triphosphate via chemiosmosis. The presence of H2O is indispensable in establishing the H+ gradient. However, it is not invariably a requisite for photophosphorylation, given that certain photosynthetic organisms possess the ability to employ alternative electron donors. The indispensability of oxygen and NADP+ in the photophosphorylation process is not warranted.

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