Photosynthesis Question

[Jay20155555]

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I just wanted some clarification. So for chemiosmosis in the chloroplasts ATP by ATP synthase, NADPH is made during mainly using the electrons at the end of the ETC. Both ATP and NADPH roles are to make Glucose with the help of CO2 and some other organic molecules during the calvin cycle....

What I just wanted to clarify is that the main purpose of ATP and NADPH is to be used in the calvin cycle to make glucose.

Also when they refer to cyclic photophosphorylation are they just talking about the the production of ATP from ATP synthase?

 

[684046]

An indicator that it is noncyclic is that water is being split. Cyclic is also more common in bacteria

 

[jsbio]

Correct, the main purpose of ATP and NADPH is to specifically combine with the 12 PGA ( phosphoglycerates) in order to make the 12 G3P's.
The reaction goes something like this 12 ATP + 12 NADPH + 12 PGA -------> 12 G3p. Now not all 12 g3p's go off and make glucose, 10 of the g3ps' combine with 6 atp to refuel the original 6 RuBp used in the previous part of the calvin cycle. 2 g3p's are used to create glucose!

Cyclic photophosphorylation
Think of it as a cycle. Instead of the electron at PS 1 being energized to form NADPH, they are re used in the orignal ETC to create additional ATP. So yes it's essentially just continued ATP production by ATP synthase.

Hope that helps!