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

Question

Quizplus · Accepted Answer

The given conditions suggest that the organism is an acidophilic thermophile, which can grow at high temperatures and low pH. Among the given options, only Thermoplasma species are known to thrive under such extreme conditions. Methanococcus species are methanogens and usually grow under anaerobic conditions. Aciduliprofundum species are acidophilic but have a lower temperature optimum than the given 55°C. Halobacterium species are halophiles and require high salt concentrations to grow.

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