Final answer:
The activities of the two compartments in fatty acid synthase are the acyl carrier protein (ACP) and the 3-ketoacyl-ACP synthase enzyme.
Step-by-step explanation:
The two compartments in fatty acid synthase are the acyl carrier protein (ACP) and the 3-ketoacyl-ACP synthase enzyme.
The ACP contains a phosphopantetheine group, which serves as an active sulfhydryl group. The growing fatty acid chain is attached to this group.
The 3-ketoacyl-ACP synthase enzyme also provides a sulfhydryl group, which is furnished by a specific cysteine residue. This enzyme catalyzes the formation of an alpha-beta unsaturated acyl-CoA, which undergoes dehydrogenation to form a trans alpha-beta unsaturated acyl-CoA.