Question

Although both molecules are two electron carriers, NADH generates 2.5 ATP and FADH2 generates only 1.5 ATPs.

1) Explain how electron transport plays a role in ATP synthesis.

2) Explain why a different amount of ATP is produced for each of these electron carriers.

Answer 1

1. The electron transport chain carries the electron form different protein complexes. This transportation of electrons results in the passage of protons according to their concentration gradient into the matrix using the ATP synthase, which will spin in response to protons and will generate ATP.

2. The two have different energy due to their first electron carrier. The NADH gives it's electron to complex I which has a higher energy level thereby producing more ATP. The FADH2 give its electron to complex II which has lower energy level thereby producing low ATP.