Select the correct statement .

Options

A. FAD is hydrogen acceptor when succinic acid is oxidized to malic acid .
B. Oxygen acts a terminal electron acceptor in aerobic respiration .
C. Cytochrome c and `a_3` contains two copper centres .
D. Respiration is a catabolic process only .

Answer

To solve the question, we need to analyze each statement provided and determine which one is correct. Let's go through them step by step.

### Step 1: Analyze the first statement
**Statement:** FAD is a hydrogen acceptor when succinic acid is oxidized to malic acid.

**Analysis:** This statement is incorrect. In the TCA cycle, FAD is reduced to FADH2 when succinate is oxidized to fumarate, not malic acid. The conversion from succinate to fumarate involves FAD, but malic acid is formed from fumarate in a different step of the cycle.

### Step 2: Analyze the second statement
**Statement:** Oxygen acts as a terminal electron acceptor in aerobic respiration.

**Analysis:** This statement is correct. In aerobic respiration, oxygen is indeed the final electron acceptor in the electron transport chain (ETC). It combines with electrons and protons to form water, which is a crucial step in the process of ATP production.

### Step 3: Analyze the third statement
**Statement:** Cytochrome C and A3 contain 2 copper centers.

**Analysis:** This statement is incorrect. Cytochrome C does not contain copper centers; instead, it contains heme groups. The complex that contains copper centers is cytochrome c oxidase (Complex IV), which includes cytochrome A and A3, but not cytochrome C itself.

### Step 4: Analyze the fourth statement
**Statement:** Respiration is a catabolic process, but the respiration in plants is anabolic.

**Analysis:** This statement is misleading. Respiration is primarily a catabolic process in both plants and animals, as it involves breaking down glucose to release energy. While plants do have anabolic processes (like photosynthesis), respiration itself is not considered anabolic.

### Conclusion
After analyzing all the statements, the correct statement is:
**Oxygen acts as a terminal electron acceptor in aerobic respiration.**

### Final Answer
The correct statement is: **Oxygen acts as a terminal electron acceptor in aerobic respiration.**

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