In prokaryotes , chromatophores are

Options

A. Specialised granules responsible for colouration of cells
B. Structures responsible for determining shape of the organism
C. Inclusion bodies lying free in the cells for carrying out various metabolic activites
D. Internal membrane system that may bacome extensive and
complex in photosynthetic bacteria.

Answer

**Step-by-Step Solution:**

1. **Understanding Chromatophores**:
- Chromatophores are specialized structures found in certain prokaryotes, specifically those that are photosynthetic.

2. **Characteristics of Chromatophores**:
- They are internal membrane structures, which means they are surrounded by membranes and are located within the cell.
- They are similar to chloroplasts found in eukaryotic plants, which are also involved in photosynthesis.

3. **Analyzing the Options**:
- **Option A**: "They are specialized granules which are responsible for coloration of the cell."
- This is incorrect because chromatophores are not primarily for coloration.
- **Option B**: "They are structures which are responsible for determining shape of the organism."
- This is also incorrect as chromatophores do not determine the shape of the organism.
- **Option C**: "They are inclusion bodies lying free in the cells for carrying out various metabolic activities."
- This is incorrect as chromatophores are not free inclusion bodies; they are structured and membrane-bound.
- **Option D**: "They are internal membrane system that may become extensive and complex in photosynthetic bacteria."
- This is correct because it accurately describes the nature and function of chromatophores in photosynthetic prokaryotes.

4. **Conclusion**:
- Based on the analysis of the options, the correct answer is **D**: "They are internal membrane system that may become extensive and complex in photosynthetic bacteria."