How many ATP are produced in cyclic Photophosphorylation?

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How many ATP are produced in cyclic Photophosphorylation?

Therefore, H+/ATP = 4.67, e-/NADPH + H+ = 2, Total ATP release in both photphosphorylation during evolution of an oxygen molecule = 3, total NADPH + H+ during evolution of an oxygen molecule at PS-II = 2 Therefore, ATP/NADPH formation from cyclic photophosrylation at P680 = 7/9 (instead of the expected 3/2) and ATP …

Does cyclic Photophosphorylation generate ATP?

The ATP and NADPH from the light-dependent reactions are used to make sugars in the next stage of photosynthesis, the Calvin cycle. In another form of the light reactions, called cyclic photophosphorylation, electrons follow a different, circular path and only ATP (no NADPH) is produced.

How is ATP produced during cyclic Photophosphorylation?

Cyclic photophosphorylation involves only Photosystem I and generates ATP but not NADPH. 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 (Figure 18.7B.

Why is cyclic Photophosphorylation important in the ATP production?

The cyclic photophosphorylation also results in the formation of ATP molecules just like in non – cyclic photo phosphorylation. As the electrons move downhill in the electron transport chain, they lose potential energy and ATP molecules are formed in the same way as in mitochondria during respiration.

What is the difference between cyclic photophosphorylation and Noncyclic photophosphorylation?

In cyclic photophosphorylation, the electrons get expelled by photosystem I and they return to the system. On the other hand, in non-cyclic photophosphorylation, the electrons that are expelled by the photosystems do not return.

Which is more efficient in producing ATP?

lecture15. Anaerobic cell respiration (glycolysis + fermentation) produces 2 ATP/glucose consumed. Aerobic cell respiration (glycolysis + the Krebs cycle + respiratory electron transport) produces 36 ATP/glucose consumed. Aerobic cell respiration is roughly 18 times more efficient than anaerobic cell respiration.

Why does cyclic photophosphorylation occur?

This is called cyclic photophosphorylation. The chloroplast shifts to this process when the ATP supply drops and the level of NADPH rises. Often the amount of ATP needed to drive the Calvin cycle exceeds what is produced in non-cyclic photophosphorylation.

Why does cyclic Photophosphorylation occur?

What is the point of cyclic Photophosphorylation?

Cyclic photophosphorylation This transport chain produces a proton-motive force, pumping H+ ions across the membrane and producing a concentration gradient that can be used to power ATP synthase during chemiosmosis.

Why is it called non-cyclic photophosphorylation?

This process is referred to as non- cyclic photophosphorylation because the lost electrons by P680 of Photosystem II are occupied by P700 of Photosystem I and are not reverted to P680. Here the complete movement of the electrons is in a unidirectional or in a non- cyclic manner.

What is the purpose of cyclic phosphorylation?

Cyclic Photophosphorylation is the process in which organisms (like prokaryotes), just accomplish the conversion of ADP to ATP for immediate energy for the cells. This type of photophosphorylation usually occurs in the thylakoid membrane.

How many ATP molecules are produced by cyclic photophosphorylation?

Because 6 turns of non cyclic photophosphorylation will produce 12 N A D P H 2 and 6 ATP molecules. And cyclic photophosphorylation will produce 12 ATP molecules. Total=12 N A D P H 2 and 18 ATP. I think Iam missing something , Please answer me if I am correct or not.

What is the difference between non cyclic and 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.

How is cyclic photophosphorylation used in the transport chain?

Cyclic photophosphorylation involves the use of photosystem-I. When light is absorbed by this photosystem, the excited electron enters the electron transport chain to produce ATP. Put your understanding of this concept to test by answering a few MCQs.

How is NADP + involved in non cyclic photophosphorylation?

On the other hand, non-cyclic photophosphorylation, NADP+ does not take the electrons; they instead sent back to cytochrome b6f complex. In bacterial photosynthesis, a single photosystem is needed and therefore is involved in cyclic photophosphorylation.

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