15. This chemical process is known as cyclic photophosphorylation.
It is one of the 2 types of light dependent reactions.
This process get its name from the fact that the energized
light is moved through a series of electron acceptors to eventually end up back
at the photosystem where it began (thus completing a cycle). It also gets its
name since light (photo-) is used to energize a phosphate group which can be
placed on ADP to make ATP.
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Long & Slichter