The presence of genes encoding RubisCO enzymes in Methanocaldococcus jannaschii and a species of Pyrococcus indicates that the organisms
A) incorporate carbon dioxide via the reverse citric acid cycle.
B) incorporate carbon dioxide via the acetyl- CoA pathway.
C) utilize molecular hydrogen as an electron donor in chemolithotrophic metabolism.
D) incorporate carbon dioxide via the Calvin cycle.

Question

Quizplus · Accepted Answer

The presence of genes encoding RubisCO enzymes suggests that these organisms are capable of incorporating carbon dioxide via the Calvin cycle, which is the primary pathway for carbon fixation in autotrophic organisms.

The Presence of Genes Encoding RubisCO Enzymes in Methanocaldococcus Jannaschii