with noncyclic electron flow alone

Cyclic Photophosphorylation
Noncyclic Photophosphorylation
Non Cyclic Electron Flow is the production of ATP by noncyclic electron flow.
Noncyclic electron flow is the route of electron flow that goes through both photosystems.
It produces ATP, NADPH, and oxygen.
The net electron flow is from water to NADP+
Noncyclic vs.

Cyclic vs. Non-cyclic Electron Flow - Mandeville High …

The most common light-dependent reaction in photosynthesis is called noncyclic photophosphorylation

Cyclic Electron Flow in Photosynthesis? | Yahoo Answers

Cyclic photophosphorylation occurs less commonly in plants than noncyclic photophosphorylation, most likely occurring when there is too little NADP+ available. It is also seen in certain photosynthetic bacteria. Cyclic photophosphorylation involves only Photosystem I and generates ATP but not NADPH. As the electrons from the reaction center of Photosystem I are picked up by the electron transport chain, they are transported back to the reaction center chlorophyll. As the electrons are transported down the electron transport chain, some of the energy released is used to pump protons across the thylakoid membrane from the stroma of the chloroplast to the thylakoid interior space producing a proton gradient or . As the accumulating protons in the thylakoid interior space pass back across the thylakoid membrane to the stroma through ATP synthetase complexes, this energy is used to generate ATP from ADP and Pi (see Fig. 4).

Cyclic Electron Flow in Photosynthesis

All phototrophic bacteria are capable of performing cyclicphotophosphorylationas described above and in Figure 16 and below in Figure 18. Thisuniversalmechanism of cyclic photophosphorylation is referred to as PhotosystemI. Bacterial photosynthesis uses only Photosystem I (PSI), but themore evolved cyanobacteria, as well as algae and plants, have anadditionallight-harvesting system called Photosystem II (PSII). Photosystem IIis used to reduce Photosystem I when electrons are withdrawn from PSIforCO2 fixation. PSII transfers electrons from H2Oandproduces O2, as shown in Figure 20.

noncyclic electron flow

Photosynthesis - Non cyclic Photophosphorylation - YouTube


These electron flows prevent the Photosystems from fully reducing all the electron carriers and causing photosynthesis to stop.
Instead, electrons can be donated to cytochrome bf instead of NADP.
Activity
Write two haiku's.

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

Cyclic vs. Noncyclic Cycles in Photosynthesis?


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.

Biology (Mader), 10th Edition Chapter 7: Photosynthesis Cyclic and Noncyclic Photophosphorylation

Non-Cyclic Photosynthesis / Cyclic Photosyntesis - …


Cyclic electron flow helps move the electrons throughout photosystem 1 for cyclic photophosphorylation.
Noncyclic electron flow moves electrons through both Photosystem 1 and 2.

Biology, Eighth Edition (Raven) Chapter 8: Photosynthesis Cyclic and Noncyclic Photophosphorylation

Cyclic Vs Non-Cyclic Photophosphorylation

The Light Reactions depend upon the presence ofchlorophyll,the primary light-harvesting pigment in the membrane ofphotosyntheticorganisms. Absorption of a quantum of light by a chlorophyll moleculecausesthe displacement of an electron at the reaction center. The displacedelectronis an energy source that is moved through a membrane photosyntheticelectrontransport system, being successively passed from an iron-sulfur protein(X ) to a quinone to a cytochrome and back to chlorophyll (Figure 16below).As the electron is transported, a proton motive force is established onthe membrane, and ATP is synthesized by an ATPase enzyme. This mannerofconverting light energy into chemical energy is called cyclicphotophosphorylation.