You know that for the oxidation of oxygen produces 2 mole of water. The oxidation of oxygen to water is a 4-electron process. For every one ferrocytochrome you can pass on one electron. So you need 4 ferrocytochromes to oxidize 1 mole of O2. Divide 64 by 4 to get the answer.
Alanine is an amino acid which is known to be converted to pyruvate.
If you have a lot of alanine, it probably means you have pyruvate being made so it would be a waste to create more. Therefore, you would like to put the breaks on the production of pyruvate. You know that insulin is secreted when there is a lot of glucose and therefore wants to put a halt to glycogenolysis and start glycogen synthesis. Also remember that insulin triggers the activation of PP-1, one of 4 classes of protein phosphatases, in the liver. Therefore you shouldn't be surprised that insulin activates another class of protein phosphatases, which activates Pyr.