Question

In cellular respiration energy is generated by:
	A)	creating an electrochemical potential across the outer mitochondrial membrane
	B)	pumping phosphate ions into the inner mitochondrial membrane
	C)	activating uncoupling protein 1 (UCP1)
	D)	reducing O2 to get water
	E)	creating an electrochemical potential across the inner mitochondrial membrane

Answer 1

E)creating an electrochemical potential across inner mitochondrial membrane.

During final stage of cellular respiration reduced equivalents produced during earlier stages of cellular respiration (FADH2,NADH) are entering to the electron transport chain. In these electron flow occurs from these equivalents to successive dehydrogenase enzymes called electron transport chain(ETC) located on inner mitochondrial membrane. Transfer of electron from these equivalents to components of ETC will pump protons from inside to outside of inner mitochondrial membrane that will create a proton gradient across the membrane. So outside the membrane thre is increased amount of protons.this causes H+ to enter mitochondria through channels (Fo portion of ATP synthase complex).and this proton influx causes ATP synthesis by ATP synthase A.