Iron porphyrin occurs in

Options

A. Anthocyanin
B. Phytochrome
C. Cytoplasm
D. FAD.

Answer

To determine where iron porphyrin occurs, we can analyze the options provided: anthocyanin, phytochrome, cytoplasm, and FAD.

### Step-by-Step Solution:

1. **Understanding Iron Porphyrin**:
- Iron porphyrin is a complex that contains iron and is part of various biological molecules, including heme and cytochromes, which are crucial in electron transport chains during respiration.

2. **Analyzing the Options**:
- **Anthocyanin**: This is a pigment found in plants that gives flowers and fruits their red, purple, and blue colors. It does not contain iron porphyrin.
- **Phytochrome**: This is a photoreceptor in plants that regulates various developmental processes in response to light. It does not contain iron porphyrin.
- **Cytoplasm**: This is the gel-like substance within the cell where various metabolic processes occur. In prokaryotes, iron porphyrin is found in the cytoplasm as part of cytochromes.
- **FAD (Flavin adenine dinucleotide)**: This is a coenzyme involved in various metabolic reactions, but it does not contain iron porphyrin.

3. **Identifying the Correct Answer**:
- Since cytochromes, which contain iron porphyrin, are present in the cytoplasm of prokaryotes, and given that cytochrome is not one of the options, the best answer from the provided choices is **cytoplasm**.

4. **Conclusion**:
- Therefore, the correct answer is **cytoplasm**.

### Final Answer:
Iron porphyrin occurs in **cytoplasm**.

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