During movement of electron through ETC

Options

A. Electron undergoes resonance
B. Electron undergoes fluorescence
C. Electron undergeos active transport
D. pH of matrix increases.

Answer

**Step-by-Step Solution:**

1. **Understanding the Electron Transport Chain (ETC):**
- The electron transport chain is a series of protein complexes located in the inner mitochondrial membrane. It plays a crucial role in cellular respiration by transferring electrons derived from NADH and FADH2 to oxygen.

2. **Movement of Electrons:**
- As electrons move through the ETC, they are transferred from one protein complex to another. This movement is coupled with the pumping of protons (H⁺ ions) from the mitochondrial matrix into the intermembrane space.

3. **Proton Pumping:**
- The energy released from the electron transfer is used to pump protons against their concentration gradient. This creates a higher concentration of protons in the intermembrane space compared to the matrix.

4. **Formation of Proton Gradient:**
- The result of this pumping action is the establishment of a proton gradient across the inner mitochondrial membrane. The intermembrane space becomes more acidic (higher concentration of protons), while the matrix becomes less acidic (lower concentration of protons).

5. **Effect on pH:**
- Since pH is inversely related to the concentration of hydrogen ions (H⁺), a decrease in the concentration of protons in the matrix leads to an increase in the pH of the matrix. Therefore, as protons are pumped out, the pH of the mitochondrial matrix increases.

6. **Conclusion:**
- Thus, during the movement of electrons through the electron transport chain, the pH of the matrix increases due to the decrease in proton concentration.

**Final Answer:**
During the movement of electrons through the electron transport chain, the pH of the matrix increases.

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