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2021-05-16

What is Photophosphorylation and when does it occur?

What is Photophosphorylation and when does it occur?

In the process of photosynthesis, the phosphorylation of ADP to form ATP using the energy of sunlight is called photophosphorylation. Cyclic photophosphorylation occurs in both aerobic and anaerobic conditions. All organisms produce ATP, which is the universal energy currency of life.

What happens during Photophosphorylation Brainly?

It takes place in the chloroplast of cells, specifically in the thylakoid membrane. In the process of phosphorylation, light is absorbed by the chlorophyll and convert ADP into ATP molecule. In this process, the phosphate group is added to ADP to form ATP by the enzyme kinases and phosphorylases.

What is the product of Photophosphorylation?

The products of linear photophosphorylation, ATP and NADPH, are used in the light-independent reactions of photosynthesis (also termed the carbon fixation cycle or the Calvin cycle). This cycle uses ATP and NADPH to convert CO2 into simple sugars.

What happens during non cyclic Photophosphorylation?

In a process called non-cyclic photophosphorylation (the “standard” form of the light-dependent reactions), electrons are removed from water and passed through PSII and PSI before ending up in NADPH. This process requires light to be absorbed twice, once in each photosystem, and it makes ATP .

Does cyclic Photophosphorylation produce oxygen?

Non-cyclic Electron Flow. 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 O2, but it does make ATP. This is called cyclic photophosphorylation.

Why is the cyclic pathway so important?

With the cyclic pathway, plants can save some time and energy. Since photosystem I is accepting electrons that are returned to it, it is not accepting electrons from the previous electron transport chain. Therefore, the first electron transport chain will be backed up, which means that photolysis will not occur

Why do plants need both cyclic and noncyclic?

Noncyclic electron transport produces ATP AND NADPH. Cyclic electron transport only produced ATP. A plant needs both processes to make enough ATP necessary for the Calvin Cycle.

Which has more energy NADP or Nadph?

Which molecule contains more energy, NADP+ or NADPH? NADPH has more energy. One phosphate was added to NADP+ to create NADPH.

What happens when a phosphate group is added to ADP?

A phosphate is removed from an ATP molecule in order to provide energy for the cell. Thus, the ATP molecule turns into an ADP molecule. We eat food which gives us energy to add another phosphate group to the ADP molecule, turning it into an ATP molecule.