Which is the only non-protein member of ETC ?
**Core Concept**
The Electron Transport Chain (ETC) is a series of protein complexes located in the mitochondrial inner membrane, playing a crucial role in cellular respiration by generating ATP through the process of oxidative phosphorylation. The ETC consists of various components, including protein complexes and non-protein molecules.
**Why the Correct Answer is Right**
The correct answer is related to the fact that the ETC includes not only protein complexes but also non-protein molecules that facilitate the electron transport process. One such non-protein molecule is essential for the functioning of the ETC.
**Why Each Wrong Option is Incorrect**
**Option A:** This choice is incorrect because it refers to a protein component.
**Option B:** This choice is also incorrect as it is related to a different aspect of cellular respiration.
**Option C:** Similarly, this option is incorrect as it does not pertain to the ETC.
**Why Each Wrong Option is Incorrect (Continued)**
**Option D:** cannot be considered as it was not provided.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that the non-protein member of the ETC is **Coenzyme Q (CoQ)**, which plays a central role in the electron transport process, facilitating the transfer of electrons between complexes.
**Correct Answer:** **D. Coenzyme Q**