Mariner 8 (also known as Mariner H) had onboard systems identical to Mariner 6, Mariner 7, and Mariner 9. This vehicle was destroyed on launch due a failure of its Atlas Centaur[?] launch vehicle's autopilot.
... or other donor molecule is split in the process; it is the light reaction which produces waste oxygen.
The light reaction also generates ATP by powering the addition of ...