What happens if cyclic photophosphorylation is inhibited?
What happens if cyclic photophosphorylation is inhibited?
In both cases it would appear that cyclic photophosphorylation alone supports active ion transport in CO2-free N2; in the presence of CO2, the inhibitors of cyclic photophosphorylation inhibit active transport more than they do photosynthesis, suggesting that there is a contribution of cyclic photophosphorylation to …
What happens when Photosystem I is inhibited?
Herbicides that inhibit Photosystem I are considered to be contact herbicides and are often referred to as membrane disruptors. The end result is that cell membranes are rapidly destroyed resulting in leakage of cell contents into the intercellular spaces. See chemical structure shown under herbicide families.
Which photosystem is responsible for cyclic photophosphorylation?
Cyclic photophosphorylation happens only in the photosystem I but non-cyclic photophosphorylation occurs in both the photosystems I and II. In the cyclic photophosphorylation, only ATP is produced, whereas, in the non-cyclic photophosphorylation both NADPH and ATP are produced.
What causes cyclic photophosphorylation to occur in photosynthesis?
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.
What does photosystem 1 do in photosynthesis?
Photosystem I is an integral membrane protein complex that uses light energy to catalyze the transfer of electrons across the thylakoid membrane from plastocyanin to ferredoxin. Ultimately, the electrons that are transferred by Photosystem I are used to produce the moderate-energy hydrogen carrier NADPH.
What happens if photosystem II is inhibited?
By inhibiting the binding of PQ, the process of photosynthetic electron transfer is interrupted, and the synthesis of ATP and NADPH in the chloroplast is compromised. This results in an inability to fix CO2 and produce the nutrients needed for the plant to survive.
How do inhibitors affect photosynthesis?
Photosynthesis inhibitors disrupt the photosynthetic (food producing) process in susceptible plants by binding to specific sites within the photosystem II complex in plant chloroplasts.
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.
Where does cyclic phosphorylation take place?
stroma lamellae
Cyclic photophosphorylation takes place in chloroplasts in the leaves. It takes place in the stroma lamellae membrane or fret channels of chloroplasts. The process of cyclic photophosphorylation involves only photosystem I.
Is NADP in the stroma?
Interior to the chloroplast’s inner membrane and surrounding the thylakoids is a fluid called the stroma….
| Goal | Use stored chemical energy to “fix” CO2 and create a product that can be converted into glucose |
|---|---|
| Location | Chloroplasts—stroma |
| Input | CO2, NADPH, ATP |
| Output | NADP+, ADP, G3P (Two G3P can be made into C6H12O6) |
What is the difference between NADP+ NADPH ADP and ATP?
What is the difference between NADP+, NADPH, ADP, and ATP? The NADPH is a full carried, NADP+ is the empty carrier,ADP is a used energy molecule, ATp is the full molecule. ATP turns into ADP+P b breaking the bonds.
What is cyclic photophosphorylation?
Cyclic Photophosphorylation. The photophosphorylation process which results in the movement of the electrons in a cyclic manner for synthesizing ATP molecules is called cyclic photophosphorylation.
What energy is used in photophosphorylation?
In photophosphorylation process, light energy is used to make a high-energy electron donor and a lower-energy electron acceptor. Electrons then move suddenly from donor to acceptor through an electron transport chain. ATP is produced by an enzyme called ATP synthase.
Where does photophosphorylation occur in the thylakoid membrane?
This type of photophosphorylation usually occurs in the thylakoid membrane. The electron begins in a pigment complex called photosystem I in cyclic electron flow. It then further passes from the primary acceptor to ferredoxin and eventually to cytochrome b6f.
Where does photophosphorylation take place in prokaryotic cells?
This takes place in the stroma of the chloroplast. When plants use light energy from photosynthesis to convert ADP to ATP, the process is known as photophosphorylation. In prokaryotes, the process of photosynthesis helps in the production of energy and not for the formation of biological molecules.
