Question

Which of the following could explain why transfer of electrons from FADH2 to Coenzyme Q (CoQ) is not coupled to proton transfer, but transfer from NADH to Coenzyme Q is?

Select one:

a. FADH2 donates more electrons than NADH to the electron transport chain.

b. Because FADH2 has higher affinity for electrons than Coenzyme Q

c. Because FADH2 is a higher energy carrier than NADH

d. Because the transfer of electrons from FADH2 to CoQ does not release enough energy.

e. FADH2 donates electrons to complex II. If Complex II pumped protons, the proton gradient would be less concentrated across the membrane.

Answer 1

D option is correct.

During transfer of electrons from FADH2 to CoQ , does not release enough energy to pump the proton in to inter membrane space.

While at complex I ,III, IV during transport or electron to these complex, release enough energy to transport proton across the mitochondria membrane.