In addition, these organisms that undergo photochemistry can and do utilize the citric acid cycle. However, the conditions are extremely harsh and require 1 M hydrochloric or 1 M sulfuric acid and strong heating at 80–140 °C.
These organisms involved in photochemical reactions can employ the citric acid cycle when subjected to harsh conditions. They require 1 M hydrochloric or 1 M sulfuric acid and strong heating at temperatures of 80–140 °C.