Which mitochondrial complex donates electrons to molecular oxygen during $ETS$?

Aerobic respiration,which yields maximum $ATP$ molecules,is completed in:

The synthesis of $ATP$ in photosynthesis and respiration is essentially an oxidation-reduction process involving the removal of energy from:

Which is the other name of oxidative phosphorylation?

In mitochondria,the proton gradient is established in which direction?

Which of these are respiratory poisons or inhibitors of electron transport chain?