Regarding CO₂ Fixation Mechanisms in the Autotrophic Green Sulfur Bacteria

Question

Regarding CO₂ fixation mechanisms in the autotrophic green sulfur bacteria,
A) Chlorobium uses the reverse citric acid cycle, and Chloroflexus uses the hydroxypropionate pathway.
B) Chlorobium uses the hydroxypropionate pathway, and Chloroflexus uses the reverse citric acid cycle.
C) both Chlorobium and Chloroflexus use the reverse citric acid cycle.
D) both Chlorobium and Chloroflexus use the hydroxypropionate pathway.

Accepted Answer

Chlorobium, a type of green sulfur bacteria, utilizes the reverse citric acid cycle for CO₂ fixation, while Chloroflexus, a type of green non-sulfur bacteria, uses the hydroxypropionate pathway for the same process.