【单选题】Mycoplasmas, rickettsiae, and chlamydiae are
【判断题】Mycoplasmas are organisms without cell walls, and can easily revert to walled organisms.
【单选题】The wall-less mycoplasmas are considered to be related to gram positive bacteria. Which of the following would provide the most compelling evidence for this?
A.
They share common rRNA sequences.
B.
Some gram-positive bacteria and some mycoplasmas produce catalase.
C.
Both groups are prokaryotic.
D.
Some gram-positive bacteria and some mycoplasmas have coccus-shaped cells.
E.
Both groups contain human pathogens.
【简答题】Which of the following does not belong to Prokaryotic
microorganisms ?A. bacteria B. mycoplasmas C. chlamydiae D. prion
【单选题】Antibiotics are mostly produced by