The absence of significant contamination is referred to as
A. sepsis.
B. bacteriostasis.
C. asepsis.
D. biocide.
Ans: C. asepsis.
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What is the evolutionary advantage of alterations of generations? a. It lowers nutritional requirements of diploid cells
b. It removes mutations in haploid cells. c. It allows for the toleration of environmental stress. d. It allows for wider distribution of habitats.
In studies of two species of barnacles in the marine intertidal zone it was observed that Chthamalus can live in the upper intertidal zone and the lower intertidal zone if Semibalanus is absent, and Semibalanus can only live in the lower zone because it is more subject to dehydration. Based on this, which of the following statements are true? Check all that apply.
_____ The realized niches of the two species differ. _____ The fundamental niche of Chthamalus is larger than its realized niche. _____ The fundamental niche of Chthamalus is larger than the fundamental niche of Semibalanus. _____ The fundamental and the realized niches of Chthamalus are the same. _____ The fundamental and the realized niches of Semibalanus are the same.
In which feature(s) should one be able to locate a complete chromosome of this bacterium?
1. nucleolus 2. prophage 3. endospore 4. nucleoid A) 4 only B) 1 and 3 C) 2 and 3 D) 3 and 4
The most likely explanation for any mass-extinction event is
A) a gradual increase in global temperature. B) coevolution of predator and prey species. C) loss of genetic diversity due to inbreeding. D) human activity. E) rapid environmental change.