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Cyclic Photophosphorylation vs. Non Cyclic Photophosphorylation: What's the Difference?

Edited by Huma Saeed || By Sumera Saeed || Updated on October 30, 2023
Cyclic photophosphorylation involves only photosystem I, producing ATP without oxygen, while non-cyclic photophosphorylation involves both photosystems I and II, producing ATP, oxygen, and NADPH.

Key Differences

In cyclic photophosphorylation, electrons from the chlorophyll molecule are excited by light energy and are passed through a series of carriers before returning to the chlorophyll. This process pumps protons across the thylakoid membrane, creating a proton gradient used by ATP synthase to generate ATP. Non-cyclic photophosphorylation also involves the excitation of electrons in chlorophyll, but these electrons are not returned to the chlorophyll molecule. Instead, they are used to reduce NADP+ to NADPH, and water molecules are split to replace the electrons and produce oxygen.
Sumera Saeed
Oct 30, 2023
The primary purpose of cyclic photophosphorylation is to produce additional ATP needed for the dark reactions of photosynthesis, while non-cyclic photophosphorylation is the main method by which energy is harvested from sunlight and used to produce the ATP and NADPH necessary for the synthesis of glucose from carbon dioxide. This distinction highlights the interdependence of the two processes in the overall mechanism of photosynthesis.
Sumera Saeed
Oct 30, 2023
In summary, cyclic photophosphorylation is a method by which plants and other photosynthetic organisms generate ATP without producing oxygen or NADPH, while non-cyclic photophosphorylation is the main way in which light energy is converted into chemical energy in the form of ATP, NADPH, and oxygen. The differences between the two processes illustrate the complexity and efficiency of the photosynthetic machinery.
Sumera Saeed
Oct 30, 2023

Comparison Chart

Photosystems Involved

Only Photosystem I
Photosystem I and II
Sumera Saeed
Oct 30, 2023

Oxygen Production

Does not produce oxygen
Produces oxygen as a byproduct
Sumera Saeed
Oct 30, 2023
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End Product

Only ATP
ATP, NADPH, and oxygen
Sumera Saeed
Oct 30, 2023

Electron Source and Destination

Electrons return to chlorophyll
Electrons do not return to chlorophyll
Janet White
Oct 30, 2023

Role in Photosynthesis

Generates additional ATP for dark reactions
Main method of harvesting energy from sunlight
Sumera Saeed
Oct 30, 2023

Cyclic Photophosphorylation and Non Cyclic Photophosphorylation Definitions

Cyclic Photophosphorylation

Cyclic photophosphorylation is a process by which ATP is formed using light energy.
Cyclic photophosphorylation is essential for plants to generate the extra ATP needed for the Calvin cycle.
Huma Saeed
Oct 30, 2023

Non Cyclic Photophosphorylation

Non-cyclic photophosphorylation is a process by which ATP, NADPH, and oxygen are formed using light energy.
Non-cyclic photophosphorylation is crucial for the production of glucose in plants.
Huma Saeed
Oct 30, 2023
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Cyclic Photophosphorylation

Cyclic photophosphorylation creates a proton gradient across the thylakoid membrane.
The proton gradient formed during cyclic photophosphorylation drives the synthesis of ATP.
Sara Rehman
Oct 30, 2023

Non Cyclic Photophosphorylation

Non-cyclic photophosphorylation involves both photosystem I and II.
The involvement of both photosystems allows non-cyclic photophosphorylation to produce more energy than cyclic photophosphorylation.
Sumera Saeed
Oct 30, 2023

Cyclic Photophosphorylation

Cyclic photophosphorylation is used to generate additional ATP for the dark reactions of photosynthesis.
Cyclic photophosphorylation provides the energy necessary for synthesizing glucose from carbon dioxide.
Sumera Saeed
Oct 30, 2023

Non Cyclic Photophosphorylation

Non-cyclic photophosphorylation produces oxygen as a byproduct.
The oxygen produced during non-cyclic photophosphorylation is released into the atmosphere.
Sumera Saeed
Oct 30, 2023

Cyclic Photophosphorylation

Cyclic photophosphorylation involves only photosystem I.
Unlike non-cyclic photophosphorylation, cyclic photophosphorylation does not produce NADPH.
Sumera Saeed
Oct 30, 2023

Non Cyclic Photophosphorylation

Non-cyclic photophosphorylation results in the reduction of NADP+ to NADPH.
The NADPH produced in non-cyclic photophosphorylation is used in the synthesis of glucose.
Sumera Saeed
Oct 30, 2023

Cyclic Photophosphorylation

Cyclic photophosphorylation does not produce oxygen as a byproduct.
Plants use cyclic photophosphorylation to generate ATP without releasing oxygen.
Sumera Saeed
Oct 30, 2023

Non Cyclic Photophosphorylation

Non-cyclic photophosphorylation is the main method by which light energy is harvested and converted into chemical energy.
Non-cyclic photophosphorylation is integral to the process of photosynthesis.
Sara Rehman
Oct 30, 2023

FAQs

What photosystems are involved in cyclic photophosphorylation?

Only photosystem I is involved in cyclic photophosphorylation.
Aimie Carlson
Oct 30, 2023

What is cyclic photophosphorylation?

A process where ATP is produced using light energy, involving only photosystem I, and not producing oxygen or NADPH.
Sumera Saeed
Oct 30, 2023

Does cyclic photophosphorylation produce oxygen?

No, cyclic photophosphorylation does not produce oxygen.
Sumera Saeed
Oct 30, 2023

Does non-cyclic photophosphorylation produce oxygen?

Yes, non-cyclic photophosphorylation produces oxygen as a byproduct.
Sara Rehman
Oct 30, 2023

What is the primary purpose of cyclic photophosphorylation?

To produce additional ATP needed for the dark reactions of photosynthesis.
Harlon Moss
Oct 30, 2023

Does cyclic photophosphorylation use water molecules?

No, cyclic photophosphorylation does not use water molecules.
Janet White
Oct 30, 2023

What photosystems are involved in non-cyclic photophosphorylation?

Both photosystem I and II are involved in non-cyclic photophosphorylation.
Sumera Saeed
Oct 30, 2023

Does non-cyclic photophosphorylation generate a proton gradient?

Yes, non-cyclic photophosphorylation also generates a proton gradient across the thylakoid membrane.
Janet White
Oct 30, 2023

Does non-cyclic photophosphorylation use water molecules?

Yes, non-cyclic photophosphorylation uses water molecules, which are split to replace the electrons.
Harlon Moss
Oct 30, 2023

What is non-cyclic photophosphorylation?

A process that produces ATP, NADPH, and oxygen by using light energy, involving photosystems I and II.
Huma Saeed
Oct 30, 2023

Does non-cyclic photophosphorylation involve the reduction of NADP+ to NADPH?

Yes, non-cyclic photophosphorylation involves the reduction of NADP+ to NADPH.
Sumera Saeed
Oct 30, 2023

Where does the electron go in non-cyclic photophosphorylation?

The electron is used to reduce NADP+ to NADPH in non-cyclic photophosphorylation.
Sumera Saeed
Oct 30, 2023

Does cyclic photophosphorylation produce ATP?

Yes, cyclic photophosphorylation produces ATP.
Harlon Moss
Oct 30, 2023

Does non-cyclic photophosphorylation produce ATP?

Yes, non-cyclic photophosphorylation produces ATP.
Harlon Moss
Oct 30, 2023

Is cyclic photophosphorylation essential for photosynthesis?

Cyclic photophosphorylation is not essential but helps in generating additional ATP for photosynthesis.
Sara Rehman
Oct 30, 2023

Is non-cyclic photophosphorylation essential for photosynthesis?

Yes, non-cyclic photophosphorylation is essential for photosynthesis as it produces the ATP, NADPH, and oxygen needed for the synthesis of glucose.
Sara Rehman
Oct 30, 2023

What is the primary purpose of non-cyclic photophosphorylation?

To harvest energy from sunlight and convert it into ATP, NADPH, and oxygen.
Janet White
Oct 30, 2023

Does cyclic photophosphorylation involve the reduction of NADP+ to NADPH?

No, cyclic photophosphorylation does not involve the reduction of NADP+ to NADPH.
Sumera Saeed
Oct 30, 2023

Does cyclic photophosphorylation generate a proton gradient?

Yes, cyclic photophosphorylation generates a proton gradient across the thylakoid membrane.
Sumera Saeed
Oct 30, 2023

Where does the electron return in cyclic photophosphorylation?

The electron returns to the chlorophyll molecule in cyclic photophosphorylation.
Harlon Moss
Oct 30, 2023
About Author
Written by
Sumera Saeed
Sumera is an experienced content writer and editor with a niche in comparative analysis. At Diffeence Wiki, she crafts clear and unbiased comparisons to guide readers in making informed decisions. With a dedication to thorough research and quality, Sumera's work stands out in the digital realm. Off the clock, she enjoys reading and exploring diverse cultures.
Edited by
Huma Saeed
Huma is a renowned researcher acclaimed for her innovative work in Difference Wiki. Her dedication has led to key breakthroughs, establishing her prominence in academia. Her contributions continually inspire and guide her field.

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