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Table 4.
Energy transformations for reactions common to cellular respiration and photosynthesis.
ReactionEnergy transferred in each reactionEnergy change
ADP + Pi → ATP 0.5 energy piece Endergonic 
ATP → ADP + Pi 0.5 energy piece Exergonic 
Electron carrier (oxidized) + H + H+ → electron carrier (reduced) 2 energy pieces Endergonic 
Electron carrier (reduced) → electron carrier (oxidized) + H + H+ 2 energy pieces Exergonic 
ReactionEnergy transferred in each reactionEnergy change
ADP + Pi → ATP 0.5 energy piece Endergonic 
ATP → ADP + Pi 0.5 energy piece Exergonic 
Electron carrier (oxidized) + H + H+ → electron carrier (reduced) 2 energy pieces Endergonic 
Electron carrier (reduced) → electron carrier (oxidized) + H + H+ 2 energy pieces Exergonic 
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