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Biology

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What are the stages of photosynthesis

What are the light-dependent reactions of photosynthesis

Is glycolysis aerobic or anaerobic

What is the Main purpose of photosynthesis

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Q: Which is a role of photosystem l in the light reactions?
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Photosystem l and photosystem ll are steps of the Calvin cycle?

No, Photosystems I and II are complexes that take part in the light reactions of photosynthesis, NOT the Calvin cycle.


What is a role of photosytem l in the light reactions?

It is placed as second photosystem in the light reactions of plants, algae and some bacteria. It is an integral membarne protein complex. It functioning the electron transfer from plastocyanin to ferredoxin. Like PSII, PSI also uses light energy to excite electrons.


What do the light reactions start with?

L


Where do electrons come from and how it gains energy during the light reaction?

They come from Photosystem ll. Photosystem ll gets them by ripping the electrons off of water by a process called photolysis. Electrons gain energy first in Photosystem ll, then later in photosystem l, through the absorption of energy from light.


What is produce during the light dependent reactions?

Light dependent reaction occurs in grana (thylakoid stack) of chloroplast. Thylakoid membrane encloses space called lumen. Outside the thylakoid is matrix called stroma. Protein complexes in the thylakoid membrane for absorption of light are Photosystem. Photosystem l (or plastocyanin) absorbs light of wavelength 700nm. Photosystem ll (or water-plastoquinone oxidoreductase) absorbs light of wavelength 680nm. During light reaction, photosystem ll absorbs light and its electron get excited and leave the photosystem ll . It regains the electron from water molecule and splits it into O2 and H+. Plastoquinone gains two H+ (protons) from stroma and two electrons from photosystem ll. It transports protons into the lumen while the electrons move towards the cytochrome b6f protein complex. Cytochrome b6f transfers electron from plastoquinone to plastocyanin. Then photosystem l (P700) accepts electrons from reduced plastocyanin. Ferredoxin is soluble protein complex in photosystem l that carries electron from iron-sulfur complex and transfers it to ferredoxin-NADP+ reductase. Ferredoxin-NADP+ reductase reduses NADP+ to NADPH. H+ which were pumped into lumen through plastoquinone go back into the stroma by passing through ATP synthase. As H+ ions pass through ATP synthase, they cause it to spin. Phosphate group and ADP on it come closer to form ATP. Therefore the products of light reaction are NADPH and ATP molecules.


What are the final electron acceptors associated with photosystem l?

NADP


What protein complex absorbs in energy that used to produce NADPH?

photosystem l ( for apex! )


Does L kiss light?

No l did not kiss light. Light kissed Misa Amen ..


How did light feel about L in death note?

Light thinks of L as a obstacle and that L has to die. No love included


Why is water involved in most metabolic reactions in the human body?

l


Which episode do l and light kiss?

L and Light do not kiss at all in the show. Sorry!


How l know l was fine by police office?

yesterday l was driving my car at the traffic light, it was in amber light, and l drove through it, but l saw police was standing at the other siade of the traffic light and saw l was driving throught the amber light, l saw he was writing and l thought he was booking my car rego . will l get fine at that moment?

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