Question

10. A number of molecules can act as electron carriers in biological systems. In cellular respiration, there are two important electron carriers, one of them being nicotinamide adenine dinucleotide. The NADH moves to the electron transport chain and donates a pair of electrons and protons resulting in NAD+. This oxidation process of NADH to NAD+ results in the liberation of 53 kcal/mole (under standard conditions), a. Considering the following reaction scheme, where does this energy come from? b. Which molecule is more stable? +2H'.2e--53kcalmol NADH

Answer 1

PAGE NO! NADH NAD+ + H+ Flavo proteinred flavoprotein → flavoproteinor & Co pred + ATP to enzyme Q Cy tochrome b Id ATP Cytochrome a Cytochrome c tochrome ao - ATP Energy is released as electron pass! through the electron transport chain. When two electron from oxidation of NADH to NADt pars through the chain, enough energy is released NADH is more energtic because it holds more bonds, therefore more energy is required to keep this molecule intact. So when trying to break the bond it will require more energy to break in it is more stable. INADt is energetically unfavourable because it is a cation Adding a hydrogen will give it. favouri bilility