Phytochrome is a:

Options

A. Lipoprotein
B. Chromoprotein
C. Flavoprotein
D. Glycoprotein

Answer

**Step-by-Step Solution:**

1. **Understanding Phytochrome**: Phytochrome is a type of protein found in plants that plays a crucial role in regulating various physiological processes, particularly those related to light perception.

2. **Analyzing the Options**:
- **Lipoprotein**: This is a complex of lipids and proteins, which is not related to phytochrome.
- **Flavoprotein**: These proteins contain riboflavin (vitamin B2) and are involved in various biological processes, but they are not the same as phytochrome.
- **Chromoprotein**: This is a type of protein that contains a pigmented prosthetic group. Phytochrome falls under this category as it is involved in the light response in plants.

3. **Conclusion**: Based on the analysis, phytochrome is best classified as a Chromoprotein, as it contains pigments and is involved in the flowering process in plants.

4. **Final Answer**: Phytochrome is a Chromoprotein.

---