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Pigment-containing membranous extensions in some cyanobacteria are:

1. Basal bodies
2. Pneumatophores
3. Chromatophores
4. Heterocysts

Correct answer: Chromatophores

Solution

Chromatophores are pigment-containing membranous extensions involved in photosynthesis. The other options serve different functions: basal bodies anchor cilia/flagella, pneumatophores provide buoyancy, and heterocysts fix nitrogen.

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