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Photosynthesis

does non-cyclic photophosphorylation reduce NADP or is just the HILL reaction that does it??

yes. 2 NADP+ molecules are reduced to 2 NADPH

this is all in photosystem I

(remember the H+ (protons) come from the photolysis of water)

Reply 2

Sarahl89

in photosystem I?? =S. ive been taught something that sounds different to that. in the diagram i learnt PSI is one of the cholrophyll molecules.. & we've done nothing about a HILL reaction? unless its just a different name for something =S

i think what i learnt is called the Z scheme..

Reply 3

ayesha2210

Non cyclic Photophosphorylation reduces NADP, and the Hill reaction is not part of photosynthesis.
It is just a reaction done to isolated chloroplasts to show that they have 'reducing power' (to show that they can reduce NADP) - but instead of using NADP, we use a chemical called DCPIP only because when DCPIP is reduced it has a colour change and so we can tell whether or not the chloroplasts have reducing power!

Free to answer any other questions :smile: