Question

in the electron transport chain, what is the energy from NADH & FADH2 being used to do?

a. To split a glucose molecule in half.

b. To actively pump H+ ions and create a proton (H+) gradient.

c. To ‘charge up’ the many electron carriers, NADH & FADH2 to be used in the electron transport chain.

d. To make 32 ATP

Answer 1

Answer : The correct option is B (To actively pump H+ ions and create a proton (H+) gradient.)

Explanation : The energy which is conserved in the form of reduced eqvivalents such as NADH and FADH2 during glycolysis and TCA cycle will enter into oxidative phosphorylation or electron transfer cahin during which they donate their electrons to sucessive electron cariers in the ETC. During these events, they simultaneously pump protons into the perimitochondrial space generating proton motive force. These protons moves back into the mitochondrial matrix via ATP synthase complex. This complex then generates ATP by condensing ADP and Pi in the mitochondrial matrix.