Prevotella is involved in almost all cases of which of the following?
A) Ear infections
B) Brain abscesses
C) Periodontal infections
D) Sinus infections
Ans: C) Periodontal infections
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Examine Figure 23.2 in your textbook. According to the figure, the closest relatives of turtles are:
A. lizards and snakes. B. sauropsids. C. tetrapods. D. crocodiles and alligators. E. hagfish.
The organism that has been most commonly associated with human disease, particularly in patients who are immunocompromised, such as those infected with human immunodeficiency virus (HIV), is:
a. Rhodococcus. b. Gordonia. c. Tsukamurella. d. Streptomyces.
What mechanism leads to changes in allele frequencies due to random chance?
A. Genetic drift B. Natural selection C. Sexual selection D. Neutral variation E. inbreeding
Which two structures play direct roles in permitting bacteria to adhere to each other, or to other surfaces?
1. capsules 2. endospores 3. fimbriae 4. plasmids 5. flagella a) 3 and 4 b) 3 and 5 c) 1 and 2 d) 1 and 3 e) 2 and 3