Question

Which modern organisms demonstrate the type of photosynthetic autotrophism that uses bacteriochlorophyll?

Options

• Deep-sea sulphur bacteria

• Blue-green algae (cyanobacteria)

• Marine planktonic sulphur bacteria

• Green sulphur bacteria in freshwater

Answer 1

Some modern marine planktonic sulphur bacteria demonstrate this type of photosynthetic autotrophism using bacteriochlorophyll pigments. This is distinct from deep-sea sulphur bacteria, which represent chemoautotrophism instead.