The number of Roseobacter in the ocean describes
A) species diversity.
B) species richness.
C) species abundance.
D) species prevalence.
Answer: C
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Which cell type is most often used in karyotyping?
a. bone b. nerve c. epithelial d. blood e. cartilage
Derived character states shared by clade members are called
A. symplesiomorphies. B. ancestral traits. C. homoplasies. D. plesiomorphies. E. synapomorphies.
On a light microscope, what do you adjust to maximize the amount of light entering the objective lens and minimize the amount of light lost to refraction?
A) Fine focus B) Ocular lenses C) Objective lens D) Condenser position
You isolate a pathogenic strain of E. coli from a patient and discover that this E. coli strain is resistant to an antibiotic. Common laboratory strains of E. coli are not resistant to this antibiotic,
nor are any other previously isolated pathogenic E. coli strains. However, such resistance has been observed in other bacteria in the hospital in which the patient was treated. This newly discovered antibiotic resistance in E. coli is most likely due to _______. (a) a mutation within a gene. (b) a mutation within the regulatory DNA of a gene. (c) gene duplication. (d) horizontal gene transfer.