When cyclic photophosphorylation occurs?

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In all kinds of phototrophs, cyclic photophosphorylation occurs when conditions cannot support growth, such as during the limitation of an essential nutrient. Under such conditions, a cell does not need NAD (P)H for biosynthesis but still needs the PMF and ATP for maintenance and survival.

Where does the process of cyclic photophosphorylation take place?

This process usually takes place in the thylakoid membrane and uses Photosystem I and the chlorophyll P700. During cyclic photophosphorylation, the electrons are transferred back to P700 instead of moving into the NADP from the electron acceptor. This downward movement of electrons from an acceptor to P700 results in the formation of ATP molecules.

What is the role of cyclic photophosphorilation in the light cycle?

Once the electron has lost all the excess energy it gained previously from the sunlight, it returns to the chlorophyll so the cycle can start all over again. The cause/ the role of cyclic photophosphorilation is to release energy. It may be due to non availability of NADP+ or it may be due to excess need of ATP.

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What happens to electrons during cyclic photophosphorylation?

During cyclic photophosphorylation, the electrons are transferred back to P700 instead of moving into the NADP from the electron acceptor. This downward movement of electrons from an acceptor to P700 results in the formation of ATP molecules.

What is non cyclic photophosphorylation?

Non-Cyclic Photophosphorylation. The photophosphorylation process which results in the movement of the electrons in a non-cyclic manner for synthesizing ATP molecules using the energy from excited electrons provided by photosystem II is called as non-cyclic photophosphorylation.


Cyclic and Noncyclic Photophosphorylation


More about When cyclic photophosphorylation occurs?


1. Cyclic Photophosphorylation – BYJUS

Cyclic Photophosphorylation. In prokaryotes, the process of photosynthesis helps in the production of energy and not for the formation of biological molecules. …

From byjus.com

2. What is cyclic Photophosphorylation? | Types and Process of Cyclic …

Cyclic Photophosphorylation: In this type, when an electron gets excited, it leaves chlorophyll, then they travel through the electron transport circuit. Then, they return to chlorophyll again after the energy transfer process to ATP is completed.

From www.vedantu.com

3. Cyclic Photophosphorylation & Noncyclic …

Jul 21, 2021 · Cyclic Photophosphorylation. The photophosphorylation process which results in the movement of the electrons in a cyclic manner for …

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5. Cyclic and Non Cyclic Photophosphorylation – VEDANTU

Photophosphorylation mechanisms, both cyclic and noncyclic, are components of ETS that carry out phosphorylation (phosphate group addition) or ATP synthesis. Conclusion As a result, we can deduce that light-dependent photosynthetic processes that carry out phosphorylation to make ATP are cyclic and noncyclic photophosphorylation.

From www.vedantu.com

6. Photophosphorylation – an overview | ScienceDirect Topics

In all kinds of phototrophs, cyclic photophosphorylation occurs when conditions cannot support growth, such as during the limitation of an essential nutrient. Under such conditions, a cell does not need NAD (P)H for biosynthesis but still needs …

From www.sciencedirect.com

7. Cyclic Photophosphorylation Flashcards | Quizlet

What does cyclic photophosphorylation produce? 1 ATP per photon. Which photosystem is used in cyclic photophosphorylation? PS1, PS2 is temporarily shut down. Is H2O used in cyclic photophosphorylation? No, electrons are constantly recycled. Since electrons never exit the cycle, is there a way to produce NADPH? No.

From quizlet.com

8. Photophosphorylation (Light reaction) – Simplified Biology

Dec 16, 2016 · Cyclic photophosphorylation: Occurs in outer thylakoids & in stroma lamellae. They possess Photosystem I. Photosystem II & NAD reductase enzyme is absent. Only photosystem I take part in cyclic photophosphorylation. Only responsible for ATP formation. No splitting of water occurs. A Chemiosmotic hypothesis for ATP formation:

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