Where does cyclic electron transport occur?

The reactions involve two types of electron flow in the thylakoid membrane. While linear electron transport generates both ATP and NADPH, cyclic electron transport around photosystem I (PS I) is exclusively involved in ATP synthesis without the accumulation of NADPH.

1. Where does cyclic Photophosphorylation occur?
2. Why does cyclic electron transport occur?
3. How does cyclic electron flow happen?
4. What is cyclic electron transfer?
5. Where does cyclic photophosphorylation takes place in the leaves explain the events in sequence?
6. Where does Calvin cycle take place?
7. Which product is formed during cyclic electron transport?
8. Does the Calvin cycle occur at night?
9. What is a photosystem and where are they found?
10. Where does photosynthesis take place?
11. What is cyclic electron transport in the photosynthetic electron transport chain Why is it necessary?
12. What is cyclic electron transport in the photosynthetic electron transport chain?
13. What is cyclic electron transport in photosynthesis?
14. Which of the following are involved in cyclic electron transport?

Where does cyclic Photophosphorylation occur?

Cyclic photophosphorylation

This form of photophosphorylation occurs on the stroma lamella, or fret channels. In cyclic photophosphorylation, the high-energy electron released from P700 of PS1 flows down in a cyclic pathway.

Why does cyclic electron transport occur?

In higher plants, the generation of proton gradient across the thylakoid membrane (ΔpH) through cyclic electron flow (CEF) has mainly two functions: (1) to generate ATP and balance the ATP/NADPH energy budget, and (2) to protect photosystems I and II against photoinhibition.

How does cyclic electron flow happen?

In cyclic electron flow, electrons are repeatedly cycled though PSI. After an electron in PSI is excited and passed to ferredoxin, it is passed back to the cytochrome complex in the first part of the electron transport chain.

What is cyclic electron transfer?

Cyclic electron transfer involves only PSI and cyt bf and was first described by Arnon (1). It involves electron flow to generate an electrochemical proton gradient across the thylakoid membrane without net production of reducing equivalents.

Where does cyclic photophosphorylation takes place in the leaves explain the events in sequence?

Cyclic phosphorylation occurs inside the thylakoid membrane of the chloroplast in the leaves. In it basically electrons are recycled, the thylakoid membranes have photo-systems that contain chlorophyll, this chlorophyll helps in the absorption of light energy.

Where does Calvin cycle take place?

Unlike the light reactions, which take place in the thylakoid membrane, the reactions of the Calvin cycle take place in the stroma (the inner space of chloroplasts).

Which product is formed during cyclic electron transport?

Under certain conditions, the photoexcited electrons take an alternative path called cyclic electron flow, which uses photosystem I (P700) but not photosystem II (P680). This process produces no NADPH and no O_2, but it does make ATP. This is called cyclic photophosphorylation.

Does the Calvin cycle occur at night?

Though it is called the "dark reaction", the Calvin cycle does not actually occur in the dark or during night time. This is because the process requires reduced NADP which is short-lived and comes from the light-dependent reactions.

What is a photosystem and where are they found?

Photosystems are the functional units for photosynthesis, defined by a particular pigment organization and association patterns, whose work is the absorption and transfer of light energy, which implies transfer of electrons. Physically, photosystems are found in the thylakoid membranes.

Where does photosynthesis take place?

In plants, photosynthesis takes place in chloroplasts, which contain the chlorophyll. Chloroplasts are surrounded by a double membrane and contain a third inner membrane, called the thylakoid membrane, that forms long folds within the organelle.

What is cyclic electron transport in the photosynthetic electron transport chain Why is it necessary?

Cyclic electron transport serves only to support the production of the pmf and thus allows ATP generation without the net formation of reductant, such as reduced Fd or NADPH.

What is cyclic electron transport in the photosynthetic electron transport chain?

In cyclic electron flow (CEF), electrons are recycled around photosystem I. As a result, a transthylakoid proton gradient (ΔpH) is generated, leading to the production of ATP without concomitant production of NADPH, thus increasing the ATP/NADPH ratio within the chloroplast.

What is cyclic electron transport in photosynthesis?

Photophosphorylation refers to the use of light energy to ultimately provide the energy to convert ADP to ATP, thus replenishing the universal energy currency in living things. A second electron carrier plastoquinone (Pq) carries the electrons to a complex of two cytochromes. ...

Which of the following are involved in cyclic electron transport?

Under conditions of stress, the NADP/NADPH ratio falls and PSI in the stromal lamellae are activated. These are involved in cyclic electron transport.