Which of following prevent formation of ATP by blocking movement of ADP across mitochondrial membrane:
**Core Concept**
ADP transport across the mitochondrial membrane is crucial for the production of ATP through the process of oxidative phosphorylation. The movement of ADP into the mitochondria is necessary for the enzyme ATP synthase to utilize ADP as a substrate for ATP synthesis.
**Why the Correct Answer is Right**
The correct answer is **A. Bongkrekic acid**. Bongkrekic acid is a toxin that specifically inhibits the ADP/ATP translocase enzyme, which is responsible for transporting ADP across the mitochondrial membrane. By blocking this transport, bongkrekic acid prevents ADP from entering the mitochondria, thereby inhibiting the production of ATP.
**Why Each Wrong Option is Incorrect**
* **Option B:** Oligomycin is an inhibitor of the ATP synthase enzyme, but it does not affect ADP transport across the mitochondrial membrane.
* **Option C:** Rotenone is an inhibitor of Complex I of the electron transport chain, which affects the production of ATP by disrupting the electron transport process, but it does not specifically block ADP transport.
* **Option D:** Antimycin A is an inhibitor of Complex III of the electron transport chain, similar to rotenone, and affects ATP production by disrupting the electron transport process, but it does not specifically block ADP transport.
**Clinical Pearl / High-Yield Fact**
Bongkrekic acid is a toxin produced by certain types of fungi, and its inhibition of ADP/ATP translocase can lead to a decrease in ATP production, resulting in cellular dysfunction.
**Correct Answer:** A. Bongkrekic acid.