Non-cyclic Electron Flow (photosynthesis light …
creating a non-cyclic electron flow
Some is siphoned off from the cycle
and drawn into other complex biosynthetic pathways where it is converted ultimately into sugars (which maybe stored as
starch) amino acids and other organic building blocks as needed.
The light-independent reactions are sometimes called 'dark reactions' though this terminology was disfavoured, since it
implies the requirement for darkness.
Cyclic Electron Transport in Photosynthesis
(Again 2 protons are pumped per electron, requiring two electrons to give the
4 protons required to synthesise one molecule of ATP).
Sometimes an electron will flow via the cyclic route, sometimes via the non-cyclic route.
Difference between Cyclic and Noncyclic Photophosphorylation
The effect of cyclic electron flow is simply the diversion of more captured to production than otherwise would be the case with alone. The reason for this diversion is simply that more is required to complete than is generated relative to production by alone.
Identify The Products Of Noncyclic And Cyclic ..
The above sketch of the cyclic process is patterned after a visualization in Moore, et al. Two photons from either the red or blue end of the spectrum fit the sensitive response of the . They are captured by the and transferred to the Photosystem I reaction center, which contributes two high energy electrons to the primary electron receptor. They are passed to ferrodoxin (Fd), an iron containing protein which acts as an electron carrier. A second electron carrier plastoquinone (Pq) carries the electrons to a complex of two cytochromes. In the process, energy is provided to produce a proton gradient across the membrane which can be used for the ADP to ATP conversion. The electrons are returned by plastocyanin (Pc) to the P700 pigment in the reaction center to complete the cycle.