Question

pls ansr a-e for thumbs up T/F questions about electron transport

a. total of 10 protons will be pumped from N to P side when electrons move from NADH to oxygen

b. glycol 3 phosphate shuttle is one of many sources of electron that can reduce co enzyme Q

c. electron from NADH must travel through complex I, II , III, before going to oxygen at complex IV

Answer 1

Solution a: T
Each of the four protons is discharged from Complex I and III, and two protons from Complex IV. So, in total 10 protons are translocated from the N side to the P side.
In Complex I, Coenzyme Q is reduced via accepting two electrons from NADH. To maintain the pH balance, four protons are pumped out from the matrix to the intermembrane space of the mitochondria.
In Complex III, the reduced Coenzyme Q transfers its electron to Cytochrome c and releases two protons. These two protons along with two other protons from the matrix are pumped out.
In Complex IV, Cytochrome c donate its electrons to oxygen to form water, and hence two protons are discharged into the intermembrane space to maintain the gradient.

Solution b: T
Coenzyme Q (Cytochrome c oxidoreductase) has a vital role in generating electrons in the Electron transport chain. It can be reduced by mainly two shuttles, viz the Glycol-3-phosphate shuttle and the Malate-Aspartate shuttle.

Solution c: T
Electrons transfer in a synchronized and well-balanced manner through each component of the Electron transport chain. NADH electrons and FADH2 electrons enter the chain through Complex I and II respectively and are transferred to Coenzyme Q which carries them to Complex III. in Complex III, the electrons are transferred to Cytochrome c, which carries forward them to Complex IV. In Complex IV, oxygen gets reduced to water by these electrons.