Author Topic: biology unit-4  (Read 1774 times)

Offline shamy de alex

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biology unit-4
« on: May 09, 2013, 10:10:12 am »
for me,light-dependent nd independent reaction is so complicated..can anyone uncomplicate thm(the process happenin inside)!!

Offline Wanderer23

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Re: biology unit-4
« Reply #1 on: May 09, 2013, 11:27:07 am »
Ill just give you the keyword

Light dependant Reaction
on the thylakoid membrane chlorophyll is located when a photon of light hits the chlorophyll molecule it absorbs light energy and as a result electrons are excited from the chlorophyll, the electrons are raised so high that they leave the chlorophyll molecule and get picked up by electron carriers now in a series of redox reactions in the electron carriers energy is released which will make ATP from  ADP and Pi.
also in the presence of light photolysis takes place
H20 ---} H+ , e-, O2 are produced now H+ go on to NADP, Electrons replace the electrons lost from Photosystem and O2 is released into atmosphere or used for respiration

JUST remember non cyclic photo phosphorylation produces reduced NADP and ATP which will be used in Light Independent Reaction

LIght independent reaction involves
it takes place in the stroma , Calvin Cycle, Carbon fixation CO2 combines with RUBP in the presence of enzyme RUBISCO, then they form GP which is then reduced by reduced NADP and energy is provvided by ATP to form TP which then forms hexose glucose etc only some of TP is used for this rest is useed to regenerate RUBP

thats not all, but its the basic best of luck for your revision

Offline shamy de alex

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Re: biology unit-4
« Reply #2 on: May 09, 2013, 05:35:42 pm »
thnkx..that helps a lot :)