Escherichia coli O157:H7 is a major cause of hemorrhagic colitis in the United.States.
Answer the following statement true (T) or false (F)
True
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Mumps is caused by a ________.
A. adenovirus B. paramyxovirus C. morbillis virus D. synctial virus
Retroviruses have a +ssRNA as their genome. In order to complete an infection, they must first make a ________ molecule, which they use to direct the synthesis of mRNA.
A. -ssRNA B. dsDNA C. dsRNA D. DNA:RNA hybrid
Bacillus anthracis strains can be separated into five categories based on
A. spore morphology. B. a genetic assay that detects variable numbers of tandem repeats in various genes. C. membrane lipid composition as determined by gas chromatography. D. serological assays for lipopolysaccharide variants.
Consider the phylogeny below. Why did Lutzoni and Pagel suggest that fungal species involved in mutualistic relationships with algae (dark grey branches) or liverworts (light grey branches) evolve faster than free-living fungi (black branches)?
a. Branch lengths for mutualistic taxa are on average longer than for free-living taxa. b. The phylogeny does not reveal any clues about evolutionary speed; separate tests were neces-sary. c. We cannot tell because there is only one independent comparison between mutualistic and free-living taxa. d. B and C.