Question

How many ATP molecules are synthesized when a succinate is oxidized through complex 2?

a) 1 ATP

b) 2 ATP

c) 3 ATP

d) 4 ATP

Answer 1

Oxidation of succinate through Complex II results in the synthesis of approximately 2 ATP molecules, as it is linked to the production of FADH2 which generates fewer ATPs than NADH.

Step-by-step explanation:

When succinate is oxidized through complex 2 in the electron transport chain (ETC), the product is one molecule of FADH2. The oxidation of one FADH2 molecule through the ETC leads to the synthesis of approximately 2 ATP molecules. This is because electrons transferred from FADH2 enter the ETC at a lower energy level compared to NADH, resulting in a smaller proton gradient for ATP production through oxidative phosphorylation.