Question

During respiration, NADH donates two electrons to the carrier know as ubiquinone. When this happens, ubiquinone:

• A. becomes oxidized
• B. passes the electrons directly to O2 which is reduced to water
• C. pumps protons across the inner mitochondrial membrane
• D. all of the above

Answer 1

The correct option is C

pumps protons across the inner mitochondrial membrane

Ubiquinone accepts two electron from NADH and transports it across the inner membrane of mitochondria.
This results in the Proton Motive Force which is used during the synthesis of ATP..