Criteria for assigning pathogens to a biosafety level include all the following except
A) ability to culture the pathogen using standard laboratory media and equipment.
B) availability of disease prevention and/or treatment.
C) level of infectivity.
D) extent of disease and mortality rates.
E) mode of transmission.
Answer: A
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Lipopolysaccharide is an important cell envelope component of ________.
A. gram-positive bacteria B. gram-negative bacteria C. mycoplasmas D. acid-fast bacteria E. protoplasts
Lipopolysaccharide of the outer membrane of gram-negative cell walls is called ________.
A. enterotoxin B. leukocidin C. exotoxin D. hemolysin E. endotoxin
Transcription is initiated when
A. initiation factors assemble ribosomal subunits, mRNA, and initiator tRNA B. RNA polymerase comes to a stop sequence C. RNA polymerase binds to a region of DNA called the promoter D. new nucleotides are added to an existing strand of nucleotides
All of the following are used as first-line drugs for treating tuberculosis EXCEPT
A) ethambutol. B) isoniazid. C) fluoroquinolones. D) rifampin. E) pyrazinamide.