Question

Describe the effect on chlorophyll-containing photosystems when the chlorophyll molecules absorb photons of light.

Answer 1

Photosystems

Explanation:

Non cyclic electron flow starts with absorption of light (a photon) by photosystem II (PSII)

• Upon absorption of photon by reaction center, P680 is excited to P680*
• The excited P680* transfer one electron to pheophytin and converted in P680+
• P680+ act as strong oxidizing agent and reduced by tyrosine, which receive electron from oxidation of water

Cyclic electron flow

• It starts when ration of NADPH/NADP+ is high (means all NADP+ converted in NADPH)
• Cyclic electron flow occurs when optimum sunlight and water is present
• In cyclic electron flow quinone, cytochrome b6f complex, plastocyanin and photosystem I are involved

Answer 2

When they absorb photons of light, photosystems initiate the light phase of photosynthesis.

This process takes place as follows:

• Photosystem II absorbs light at 680nm.
• This increases the energy level of the chlorophyll, leaving it very energized.
• This allows a flow of electrons to start, through an electron transport chain, which is intended to produce ATP.
• During this process, Photosystem I absorbs light at 700nm, which leaves its chlorophyll highly energized.
• In this process, photosystem I reduces ferredoxin, which reduces NADP++.
• This results in NADP+ and H++ molecules, which are used to form more ATP.

The molecules formed in this process are sent to the dark phase of photosynthesis. At the same time, the electrons from the electron stream are reduced and sent to the chlorophylls, so that the process starts again.

More information:

https://brainly.com/question/19685287?referrer=searchResults