Transcript for:
Understanding the Photosynthesis Process

so to summarize the entire process of photosynthesis the photosynthesis process is divided into number one the light dependent reaction and light independent reaction um now focusing on the light dependent to reaction first to summarize the light dependent to reaction it happens in the thid or the granum of the chlorop plus and under the light dependent reaction there are two processes the first one is the n cyclic photo phosphorilation where light hits water water under goes photolysis where it's broken down and the electron produced from that photolysis of water will travel to photosystem 2 light will also hit photosystem 2 it photo activates the reaction Center in photosystem 2 which causes an electron to be released to photos system one and of course light will also hit photosystem one causing the photoactivation of photosystem 1's reaction Center and an electron will travel towards the enzymes now when the electron moves from photosystem one to the enzymes that drives the production of reduced natp and when the electron moves from moves from photosystem 2 to photosystem 1 that powers the electron transport chain and causes chem osmosis in the thid which allows for the production of ATP to take place so in noncyclic photo phosphorilation two things are produced which are reduced nadp and ATP uh oxygen is also produced due to the photolysis of water but I did not include it here because oxygen is a waste product in cyclic photo phosphorilation remember it only involves photosystem one where light hits photosystem one photo activates the reaction Center the electron gets excited it moves out but turns back to photosystem one this Powers the ETC and causes chem osmosis which only causes the production of ATP to happen so in CYCC photo phosphorilation the main purpose is just to produce some extra ATP the light independent reaction also known as the Kelvin cycle happens in this troma it first begins with something called rubp a five carbon molecule added together with carbon dioxide the books will call it carox or carbon fixation and this process is catalyzed by an enzyme known as rubisco which is the enzyme that is quite important here the six carbon molecule will then get broken down to become phosphoglycerates or glycerate phosphate which are three carbon molecules now for the phosphoglycerates and glycerate phosphates what needs to happen is they need to undergo reduction where it needs to form carbon hydrogen bonds but for that proc process to take place they need reduced nadp and ATP and as you can see here I'm highlighting that blue color Arrow there that's where the reduced nadp and ATP will be used to dve the reduction of PG or GP and because of this what will actually happen is it will produce something known as trios phosphates now some of the trios phosphates if you remember have to be regenerated back into rubp because it's a C so to regenerate the rubp that's where the extra ATP is used up as I've highlighted in the Green Arrow right that that's why extra ATP is needed in the Kelvin cycle but some of the trios phosphates can become the organic molecules such as sugars like glucose and fructose and some of those thos phosphates can be added together with ammonium or nitrates to become amino acids so in its entirety this is the summary of the light dependent to reaction and light independent to reaction of photosynthesis