Mobile electron carrier in ETS in mitochondrial membrane is

Options

A. Complex I
B. Cyt c
C. Cyt `a-a_(3)`
D. Cyt `bc_(1)`

Answer

**Step-by-Step Solution:**

1. **Understanding the Electron Transport Chain (ETS):**
- The Electron Transport Chain (ETS) is a series of protein complexes and mobile electron carriers located in the mitochondrial membrane. It plays a crucial role in cellular respiration by transferring electrons and pumping protons to create a proton gradient.

2. **Identifying Components of ETS:**
- The ETS consists of four main protein complexes (Complex I, II, III, and IV) and two mobile electron carriers. The mobile carriers are essential for transferring electrons between the complexes.

3. **Recognizing the Mobile Electron Carriers:**
- The two mobile electron carriers in the ETS are:
- **Coenzyme Q (CoQ)**, also known as **Ubiquinone**: It receives electrons from Complex I and Complex II and transfers them to Complex III.
- **Cytochrome C**: It transfers electrons from Complex III to Complex IV.

4. **Analyzing the Options Given:**
- The question provides four options:
- Complex I
- Cytochrome C
- Cytochrome A and A3
- Cytochrome bc1
- We need to identify which of these is a mobile electron carrier.

5. **Evaluating Each Option:**
- **Complex I**: This is a protein complex, not a mobile carrier. (Incorrect)
- **Cytochrome C**: This is indeed a mobile electron carrier. (Correct)
- **Cytochrome A and A3**: These are components of Complex IV, not mobile carriers. (Incorrect)
- **Cytochrome bc1**: This refers to Complex III, not a mobile carrier. (Incorrect)

6. **Conclusion:**
- The correct answer to the question "Mobile electron carrier in ETS in mitochondrial membrane is" is **Cytochrome C**.

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