which pf the following components of the electron transport chain accepts electrons as free radicals? a, cytochrome b,oxygen c, coenzyme d, fmn e, all the above

Question

anonymous · Answer

Strictly speaking, radicals are nothing more than a chemical term for atoms/molecules with highly reactive unpaired electrons.
Oxygen radicals have an important biological role in all sorts of cellular (damage) processes.
Cytochromes work with redox reactions, and a much more large molecule can't really be called a radical. Coenzymes have many ways to interact but all work on a molecular level too, and I have no idea what is meant by FNM. So I'd say B: O.

anonymous · Answer

Hard to say.  If by free radical you mean a single electron, it could be oxygen or cytochrome b.  Cytochrome b however is very important in the ETC and is a carrier for electrons/protons.  That would be my guess, but the question is worded strangely...

anonymous · Answer

It's Oxygen. That's why the ETC only happens during aerobic respiration. Oxygen is reduced in the chain, and the kinetic energy of the electron causes ATP to be formed (on a large scale, fuzzy about the details).
Answer: B. Oxygen