Question

Describe three types of ENERGY found in the Electron Transport System AND put them in the correct order.

Answer 1

The electron transport chain is one of the steps in cell's processes that make energy.

Three types of ENERGY found in the Electron Transport System. They are

1. Mitochondrial NADH+H+ arrives directly at the ETC from the Tricarboxylylic acid cycle (TCA) cycle and immediately oxidizes to NAD+, with its protons (H+) remaining in the matrix and its electrons (e-) going to complex I and the complex I immediately goes through a series of redox (reduction and oxidation) reactions. These reactions create a proton pump within complex I, pumping (or translocating) 4H+ from the matrix through the protein into the intermembrane space. The e- now transfer to mobile carrier Q and NAD+ returns to its original source to pick up more hydrogen ions.

2. Mobile carrier Q also picks up all of the e- on complex II and shuttles the e- it collects to cytochrome complex III. The e- are then transferred to complex III, which also immediately goes through redox (reduction and oxidation) reactions. This again creates a proton pump, pumping 4H+ from the matrix through complex III, directly into the intermembrane space of the mitochondrion.

3. The e- are now shuttled from complex III to complex IV by mobile carrier C. As the e- transfer onto cytochrome complex IV, it immediately goes through another redox (reduction and oxidation) reactions. This creates a final proton pump, pumping 2H+ from the matrix through cytochrome complex IV, directly into the intermembrane space of the mitochondrion.