A catalase-positive, gram-positive bacillus that is not acid-fast, does not branch, and does not form spores could possibly belong to which group of bacteria?
a. Corynebacterium
b. Bacillus
c. Actinomyces
d. Mycobacterium
A
The genera described in this chapter, including Corynebacterium species, are all catalase-positive, gram-positive rods. They are not acid-fast, most do not branch, and they do not form spores.
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Which of the following is most true of sexual reproduction?
A) Sexual reproduction allows for more rapid population growth than does asexual reproduction. B) Only half of the offspring from sexually reproducing females are also females. C) Asexual reproduction produces offspring of greater genetic variety. D) Sexual reproduction is completed more rapidly than asexual reproduction. E) Asexual reproduction is better suited to environments with extremely varying conditions.
Which technique(s) is/are used to help identify and classify bacteria?
A. Microscopic examination B. Culture characteristics C. Biochemical tests D. Nucleic acid analysis E. All of the choices are correct.
When was the human genome officially sequenced?
a. 1975 b. 2003 c. 1989 d. 1953 e. 2001
In this type of interaction, one organism is unharmed while the other benefits
a. commensalism b. mutualism c. symbiosis d. predation e. parasitism