Pigment-containing membranous extensions in some cyanobacteria are

Options

A. Basal bodies
B. Pneumatophores
C. Chromatophores
D. Heterocysts

Answer

To solve the question about the pigment-containing membranous extensions in some cyanobacteria, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Cyanobacteria**: Recognize that cyanobacteria, also known as blue-green algae, are prokaryotic organisms. They do not have membrane-bound organelles.

2. **Identify the Role of Chlorophyll**: In cyanobacteria, chlorophyll is essential for photosynthesis. Since they lack chloroplasts, the chlorophyll must be located in other structures.

3. **Location of Chlorophyll**: Since cyanobacteria are prokaryotic and lack organelles like chloroplasts, the chlorophyll is found in the infoldings of the plasma membrane.

4. **Identify the Correct Term**: The infoldings of the plasma membrane that contain chlorophyll and are involved in photosynthesis are known as chromatophores.

5. **Select the Correct Answer**: Based on the information, the pigment-containing membranous extensions in cyanobacteria are chromatophores.

### Final Answer:
The pigment-containing membranous extensions in some cyanobacteria are **chromatophores**.

---