Non-cyclic phosphorylation

How does Electron transfer work? The electrons released by photosystem II are

accepted by electron acceptor A, which passes the electron along a chain of electron carriers, at subsequently lower energy levels, this drives the movement of H+ to the inter-membrane space of the chloroplast.

The H+ ion build-up allows them to diffuse back via chemiosmosis, which in turn generates ATP using an enzyme known as ATP synthase.

The reduced energy electrons are passed into photosystem I to replace those previously emitted from the P700 molecule.

NADP

What is NADP? NADP is a Coenzyme used in photosynthesis.

What are Coenzymes?Coenzymes are molecules that aids the function of an enzyme.

Forming Reduced NADP At the final stage of non cyclic

phosphorylation, the electrons are transferred to NADP along with H+ from the stroma to form reduced NADP.

NADP + H+ === Reduced NADP

How are electrons replaced?

When chlorophyll loses it’s electrons, more electrons are required to repeat the process.

Light breaks down H2O into H+, O2 and e-.

H20 [ H+ ] + ½ O2 + e-

The electrons released then replace those lost from photosystem II.