Question

When dicyclohexylcarboiimide (DCCD) is added to a suspension of tightly coupled, actively respiring mitochondria, the rate of electron transfer (measured by O2 consumption) and the rate of ATP production dramatically decrease. If a solution of 2,4-dinitrophenol (DNP) is now added to the preparation, O2 consumption returns to normal but ATP synthesis remains inhibited. What process in electron transfer or oxidative phosphorylation is affected by DCCD

Answer 1

The process in electron transfer or oxidative phosphorylation that is affected by DCCD is ATP synthesis.

Step-by-step explanation:

Dicyclohexylcarboiimide( DCCD) is an organic compound that is insoluble in water which inhibits ATP ( Adenosine Triphosphate) production through its inhibitory effects on ATP synthase. When DCCD was added to a suspension of tightly coupled, actively respiring mitochondria the rate of ATP production dramatically decrease because of its inhibitory effect on ATP Synthase which is the final enzyme in the oxidative phosphorylation pathway that leads to ATP production.

Electron transfer involves the movement of electrons from one biological cell to another. Respiration and oxygen binding are the two biological processes that involves electron transfer.