In order to make the proton gradient, protons are pumped across the mitochondrial membrane at several points in the electron transport chain. However, that proton gradient is only used to make ATP by the ATP synthase, which is technically separate from the electron transport chain.
His parents were both heterozygous for hyperthermia and had the recessive gene. (hope this helps)
This answer should be A !
The answer is a) a rubber band
