Streptococcus mutans is a major cause of cavities. It resides in the gum pockets, does not have catalase activity, and can be grown outside of an anaerobic chamber. The bacterium is probably which of the following?
A. a facultative anaerobe
B. an obligate aerobe
C. an obligate anaerobe
D. an aerotolerant anaerobe
Ans: D. an aerotolerant anaerobe
You might also like to view...
Which of the following statements regarding altitude and climate are true?
I) Species composition on different sides of a mountain range are often different from each other. II) Rain shadows may appear on one side of a mountain range. III) The higher the altitude, the warmer the climate. IV) Both sides of a mountain range generally receive equal amounts of precipitation. A) only I and II B) only III and IV C) only I, II, and IV D) only II, III, and IV E) only I, II, and III
Which type of research technique was used to track newly synthesized RNA within a eukaryotic cell?
A) in situ hybridization B) band shift assay C) pulse-chase D) Southern blotting E) DNA footprint protection assay
Which of the following statements is not true about natural selection?
a. Offspring of individuals that are better adapted will make up a larger proportion of the next generation. b. Natural selection directs evolution by preserving traits acquired during an individual's lifetime. c. Natural selection depends on the genetic variability in a population, which arises through mutations. d. Natural selection acts to preserve favorable traits and eliminate unfavorable traits. e. Natural selection leads to adaptive evolutionary change.
Infections with Legionella pneumophila are usually transmitted via aerosols from contaminated air conditioning systems, showers, and humidifiers
Indicate whether the statement is true or false