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PHOTOPHOSPHORYLATION

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Photophosphorylation is the process of producing ATP molecules from the ADP
during the biological process of photosynthesis in the presence of light energy;
therefore it is also called as the light-dependent reactions
...




There are two types of photophosphorylation –

1) Cyclic Photophosphorylation
2) Non – cyclic Photophosphorylation

Cyclic photophosphorylation


The process of photophosphorylation in which an electron expelled by the excited photocenter is returned to it after passing through a series of electron carriers is known as cyclic
photophosphorylation is
...




The photophosphorylation process which results in the movement of the electrons in a
cyclic manner for synthesizing ATP molecules is called cyclic photophosphorylation
...




During cyclic photophosphorylation, the electrons are transferred back to P700 instead
of moving into the NADP from the electron acceptor
...




ATP is formed when electrons pass Ferredoxin to PQ and from PQ to the Cytochrome
system
...


Non-cyclic photophosphorylation


It is the normal process of photophosphorylation in which the electron expelled by the
excited photocentre does not return to it
...




In this process, electrons are released by the photolysis of water
...




Both ATP and NADPH are formed
...
Here the complete movement of the electrons is in a
unidirectional or in a non- cyclic manner

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