Cyclic & Noncyclic Electron Flow - YouTube


Photolysis, water splitting, is present.
Oxygen changes during the process.
Takes place in plants.
Noncyclic Diagram
Cyclic Photophosphorylation
Uses only Photosystem 1
The reaction center is P700
The electrons travel in a cyclic manner
Photolysis is not present.
Oxygen does not change throughout the process.
Most often used by bacteria.
Steps That Lead to Phosphorylation
Photosynthesis is a two step process that consists of the light and dark reactions.
Photophosphorylation is the process of generating ATP from ADP , by proton motive force generated by the thylakoid membrane.
Photophosphorylation takes place during the light reaction step in photosynthesis.
In light reaction, the addition of phosphate in the presence of light is called photophosphorylation.

Non-cyclic Electron Flow (photosynthesis light …

In anoxygenic photosynthesis various electron ..

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.


It is non-cyclic because the electrons travel in a Z- shape (in redox potential space) and do not end where they started.

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.

Cyclic DiagramConnections to Electron FlowBoth cyclic and noncyclic photophosphorylation have an electron flow.

Noncyclic Electron Flow - Biology As Poetry

Compare to cyclic electron flow: (9) Photosystem I oxidation/e- transfer to primary electron acceptor (4) Transfer of electron to electron transport chain (5) Photophosphorylation (6) Reduction of photosystem I (7) Photon capture by photosystem I (8) Energy transfer to reaction center chlorophyll (9) Photosystem I oxidation/e- transfer to primary electron acceptorLoading

06/01/2018 · Cyclic Electron Transport in Photosynthesis ..

Cyclic vs. Non-cyclic Electron Flow

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.

View Non-Cyclic Electron Flow Assessment from SCIENCES o1 at Virtual University of Pakistan

in non-cyclic electron flow and the ..

Cyclic electron flow avoids both and the donation of electrons to +. instead are passed from to an , resulting in , and then returned to , returning that to its ground state. Also can be described as a .

This cyclical process is rather than those being originally sourced from . The process is described as cyclical because rather than flowing from one component of the to another ( to +), they instead cycle back to the same component ( to ).