How many electrons must move down the electron transport chain before energy is made?
3
5
4
2
2
In order for energy to be made, two electrons must move down the electron transport chain.
To determine how many electrons must move down the electron transport chain before energy is made, we need to understand the process of electron transport in cellular respiration.
During cellular respiration, electrons are transferred along a series of protein complexes in the inner mitochondrial membrane called the electron transport chain. This transfer of electrons creates a flow of energy that is used to generate ATP (adenosine triphosphate), the main form of energy in cells.
To produce one molecule of ATP, approximately 2 electrons need to move down the electron transport chain. These electrons are donated by NADH and FADH2, which are molecules that carry high-energy electrons generated during earlier stages of cellular respiration.
Therefore, the correct answer is 2.