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

Biology & Microbiology

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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.

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology