A newly discovered organism is found to use sulfide (S2−) for aerobic respiration and carbon dioxide (CO2) from the air as a source of carbon, much like a plant. This organism must be a ________.
A) photoautotroph
B) chemoorganoautotroph
C) photoheterotroph
D) chemolithotrophic heterotroph
E) chemolithoautotroph

Question

Quizplus · Accepted Answer

Since the organism uses sulfide for aerobic respiration and carbon dioxide from the air as a source of carbon, it is most likely a chemolithoautotroph. This classification indicates that the organism derives energy from chemicals (chemo), obtains carbon from carbon dioxide (auto), and does not require sunlight for energy (therefore not a photoautotroph).

A Newly Discovered Organism Is Found to Use Sulfide (S2−)