Homework SourseConsider the redox reaction in which FADH2 enters the electr
Consider the redox reaction in which FADH2 enters the electron transport chain by reacting with cytochrome c. Answer the following questions based on the forward direction of the reaction as shown below (answers may be used more than once).
FADH2 + 2cytochrome c(Fe3+) FAD + 2cytochrome c(Fe2+) + 2H+
cyto c(Fe2+)
FAD
cyto c(Fe3+)
FADH2
cyto c(Fe3+)
FADH2
| Which endproduct, FAD or cyto c(Fe2+), lost electrons from the reaction? | cyto c(Fe2+) FAD |
| Which reactant, FADH2 or cyto c(Fe3+), becomes reduced from the reaction? | cyto c(Fe3+) FADH2 |
| Is FADH2 or cyto c(Fe3+) the reducing agent? | cyto c(Fe3+) FADH2 |
Solution
1. In the electron transport system NADH and FADH2o lose the electrons and the energy from those electrons is used to produce ATP at the end of electron transport chain the energy of glucose molecule is converted to a form that the cell can use.
2. Cyt- c. In electron transport cycle electrons move through the cytochromes .various cytochromes have different heme groups which generate different environment for Fe ion, therefore they have different reduction potential or tendency to accept electron leading to the Uni directional electrons flow along the chain.
3.FADH2 is reducing agent as it loses electrons.
