Final answer:
FAT/CD36 is the fatty acid transporter primarily active during the fasted state, facilitating the uptake of fatty acids into cells for oxidation.
Step-by-step explanation:
The fatty acid transporter that is primarily active in a fasted state is FAT/CD36. In the fasted state, the body relies on the mobilization of fatty acids for energy, which involves the transport of fatty acids into cells for oxidation. FAT/CD36 is one of the key proteins involved in this process, as it facilitates the uptake of fatty acids into tissues such as skeletal muscle and adipose tissue. In contrast, fatty acid transport protein (FATP) and fatty acid binding protein (FABP) have roles in fatty acid transport and binding within various cellular contexts, and their activity is not specifically linked to a fasted state. Moreover, the concept of converting a fatty acid to fatty acyl carnitine is important for transport through the mitochondrial membranes, allowing these fatty acids to be oxidized for energy production in the fasted state.