Which of the following is true about the cell-wall-less archaeal genus Thermoplasma?
A. They are filamentous at temperatures at 59°C and higher.
B. They are spherical at temperatures below 59°C.
C. They are spherical at temperatures below 59°C and they are filamentous at temperatures at 59°C and higher.
D. They are nonmotile.
Answer: C
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