Which of the following is incorrect regarding Yersinia pestis?
A. It produces coagulase as a virulence factor.
B. It has a capsule as a virulence factor.
C. It produces an enterotoxin.
D. It exhibits bipolar staining and appears to resemble a safety pin.
E. It is a gram-negative rod.
Answer: C
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Diazotrophs are obligately symbiotic bacteria that fix N2 into ammonia, thus providing a critical source of nitrogen to their host
Indicate whether the statement is true or false.
Salmon are well known for their ability, after growing to maturity in the ocean, to find their way back to the streams where they were born in order to breed. For this kind of navigation, they likely:
A. use magnetotaxis only. B. use map information only. C. rely on kinesis only. D. use a variety of environmental cues. E. use only a combination of magnetotaxis and kinesis.
Which of the following groups of bacteria have Clinical Laboratory Standards Institute (CLSI) guidelines that describe specific testing methods and interpretative standards for susceptibility reporting?
a. A. facilis and Stenotrophomonas malto-philia b. P. fluorescens and R. mannitolilytica c. P. aeruginosa and B. pseudomallei d. B. cepacia and B. vesicularis
B is an intron between two exons, A and C. Which representation best describes how this region of mRNA will appear after it is transcribed and processed by a spliceosome?
A) A-C B) A-B C) B-C D) A-B-C