When flavoprotein transfers electrons directly to the final electron acceptor, hydrogen peroxide is produced. What other consequences might result from electron carriers in the ETC being bypassed? (Hint: See Section 5 Introduction and Appendix A.)

Flavoprotein which are involved in electron transfer are located in inner mitochondrial membrane and accepts the electrons from primary dehydrogenases and transfer to electron transferring flavoprotein dehydrogenase which finally transfer them to coenzyme Q in a normal mechanism.

So if flavoprotein transfers the electrons directly to final electron acceptor it would produce a highly potent oxygen radical "hydrogen peroxide". Apart from this the other effect would be;

The less protons would be pumped to intermembrane space of mitochondria and ultimately the production of ATP would be decreased. The energy of electrons would be lost in heat as it is not utilized for the production of ATP so there would be more heat production.