A chemoorganotroph growing optimally at 55°C and pH 2 in complex media would most likely be a member of the genus
A) Methanocaldococcus.
B) Halobacterium.
C) Methanococcus.
D) Thermoplasma.

Question

Quizplus · Accepted Answer

The conditions described in the question (optimal growth at 55°C and pH 2) suggest a thermophilic and acidophilic organism. The only option among the choices provided that fits this description is Thermoplasma. Methanocaldococcus, Methanococcus, and Halobacterium are all extremophiles as well, but they grow optimally at different temperatures and/or pH levels.

A Chemoorganotroph Growing Optimally at 55°C and PH 2 in Complex