This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Long chain fatty acid is transported into inner mitochondria membrane by 
Select and explain. 
A. Acyl carrier protein, B. Acyl carnitine, C. Simple diffusion, D. Energy mediated
B: Acyl carnitine
Answer: B: Acyl carnitine 
Explanation: Acyl carnitine 

Activated long chain fatty acid (acyl CoA) cannot penetrate the inner mitochondrial membrane.
Acyl group of acyl CoA is transferred to carnitine, resulting in the formation of acylcarnitine.


Acylcarnitine is then transported across the inner mitochondrial membrane into the mitochondrial matrix by translocase.


Once inside the mitochondrion, an acyl group of acylcarnitine is transferred back to CoA, resulting in the formation of acyl-CoA which undergoes β -oxidation.