The electron donor that replenishes the ps ii reaction center is and for the ps i reaction center is _.

A chemical substance that donates electrons to another component is known as an electron donor.
It is a reducing agent that causes its own oxidation as a result of contributing electrons.
Covalent or ionic reaction chemistry permanently changes the chemical makeup of typical reducing agents.
An electron donor that bonds to an atom other than hydrogen is known as a nucleophile.
A base is a hydrogen-bonding electron donor.
Ions or compounds that donate electrons function as reducing agents and are known as electron donors.
The proton gradient in the intermembrane gap is produced by NADH molecules donating electrons that are then transmitted through a number of different proteins.
When the electron reaches the last protein, it forms a link with an oxygen molecule to produce water.

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The electron donor that replenishes the ps ii reaction center is ______ and for the ps i reaction center is _______.