Abstract
Photosynthesis consists essentially in the conversion of light energy into redox energy, and respiration in the subsequent conversion of redox energy into phosphate-bond energy. Based on experimental facts, it is proposed that the primary event in the biological transduction of redox energy into chemical-bond energy is the formation of a rich-energy compound in the broadest sense of the word (chemical, electronic, structural). The energy-transducing redox systems are constituted by two pairs of alternating potentials (depending on the activation state of one of the forms of the pair) and correspond to one of the following types: those which energize their reduced form, lowering the potential of the pair, and those which energize their oxidized form, increasing the potential of the pair. Water is a source of reducing power only in photosynthesis but not in respiration.
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