Final answer:
Complex II, also known as succinate dehydrogenase, is the first component of the electron transport chain that accepts electrons from an FADH₂ molecule. It delivers the electrons directly to the electron transport chain, bypassing the first complex. This leads to fewer ATP molecules being produced.
Step-by-step explanation:
The first component of the electron transport chain that accepts electrons from an FADH₂ molecule is complex II. Complex II, also known as succinate dehydrogenase, directly receives FADH₂ and bypasses the first complex (complex I). It forms a small complex with the enzyme and delivers electrons directly to the electron transport chain. Since these electrons bypass the first complex, fewer ATP molecules are made compared to electrons from NADH.