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Exactly where in the chloroplast is NADP reduced?

Geckogirl64

My text books tell me it is in the stroma but the answer to the exam question said thylakoid membranes...

Reply 1

Ursin

I wOuldsay the thylakoid membrane that's where the LDR takes place I think?

(edited 11 years ago)

Reply 2

Pride

Original post by Geckogirl64

My text books tell me it is in the stroma but the answer to the exam question said thylakoid membranes...

are you sure that's what it says in the textbook? Shouldn't it say reduced NADP is made in non-cyclic phosphorylation, which occurs in the thylakoid membrane? Does it mean that reduced NAD is oxidised to release hydrogen atoms in the stroma for the light independent reaction?

Reply 3

Jckc123

The NADP is reduced at the thylakoid membrane during light-dependent stage whereas the reduced NADP releases back the hydrogen atoms during light-independent stage in the stroma when GP is converted into TP.

Reply 4

username133326

yep, having read this... if i sat a-level biology again i'd get a U for sure...

the worst bit? i'm on course for a 2.1 in zoology :moon:

Reply 5

TheNoobyPotato

Original post by Geckogirl64

My text books tell me it is in the stroma but the answer to the exam question said thylakoid membranes...

Firstly, for reduction to occur, electrons must be gained. Alternatively, hydrogen can be gained (not just a hydrogen ion, it would need to be a hydrogen ion and electron.)

So, the NADP is reduced by the electrons from the chlorophyll in the light dependant stage and then a H+ ion from the water that breaks down from photolysis also goes towards this forming NADPH (reduced NADP). All this is in the thylakoid membrane.

(p.s. HATE PHOTOSYNTHESIS SOOOO MUCH)

(edited 11 years ago)

Reply 6