For every one nadh molecule oxidized at complex i, how many total hydrogen ions are pumped across all of the complexes from the mitochondrial matrix to the inner membrane space?.

For every one NADH molecule oxidized at complex i , 10 total hydrogen ions are pumped across all of the complexes from the mitochondrial matrix to the inner membrane space.

How many complexes are involved in mitochondrial electron transport?

4 proteins

The oxidative phosphorylation process, also known as the electron transport chain, is a collection of four protein complexes that combine redox events to produce an electrochemical gradient that results in the production of ATP.
Both photosynthesis and cellular respiration take place in mitochondria.

What distinguishes Complex 1 from Complex 2 in particular?

Complex I pulls four protons from the matrix into the intermembrane gap and absorbs high energy electrons from NADH.
Succinate dehydrogenase is in Complex II.
In the Krebs cycle, Complex II transforms succinate to fumarate and produces FADH2.
Directly obtaining FADH2, Complex II provides two electrons to electron transport system..

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