Final answer:
Beta-oxidation of short/medium chain fatty acids primarily occurs in the mitochondrial matrix, where fatty acids are converted into acetyl-CoA and then used in the Krebs cycle to produce ATP. Option A is correct
Step-by-step explanation:
The process of beta-oxidation involves the breakdown of fatty acids and takes place primarily in the mitochondrial matrix. Fatty acids are initially converted into fatty acyl-CoA molecules in the cytoplasm. These molecules are then attached to carnitine, creating a fatty acyl carnitine molecule that is transported across the mitochondrial membrane.
Once inside the mitochondrial matrix, fatty acylcarnitine is converted back into fatty acyl-CoA and, subsequently, into acetyl-CoA. This acetyl-CoA then enters the Krebs cycle, contributing to ATP production. Peroxisomes also contribute to fatty acid oxidation, particularly with very long-chain fatty acids, which are shortened before they are handed off to the mitochondria for further beta-oxidation.