Resolution is the
A) ability of an optical instrument to show two close objects as separate.
B) size of an image.
C) ability of an optical instrument to magnify an image.
D) distance between the lenses of a microscope.
Answer: A
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Transformation is defined as the:
a. change of the bacterial genotypes through the exchange of DNA from one cell to another. b. internal change in the original nucleotide sequence of a gene or genes within an or-ganism's genome. c. process by which genetic elements such as plasmids and transposons excise from one genomic location and insert into another. d. uptake of free DNA from the environment and recombination with the recipient's homologous DNA.
Escherichia coli, a member of the family Enterobacteriaceae, was resistant to the antibiotic vancomycin. Which of the following statements explains this discrepancy?
a. The vancomycin disk has most likely ex-pired. b. Vancomycin should only be used in viral infections, not bacterial infections. c. The plate is most likely contaminated with another organism. d. No discrepancy is present. E. coli is resis-tant to vancomycin.
A positive test was observed on a serum sample that resulted in the formation of a fine precipi-tate on a reaction card. The most likely organism serologically identified is:
a. Chlamydia trachomatis. b. Bacillus anthracis. c. Treponema pallidum. d. Toxoplasma gondii.
Although high caloric input is an obvious cause of obesity, which of the following factors also
contribute(s) to this disease?
a. an inactive lifestyle b. a strong genetic component c. the availability of nonhealthy foods d. both an inactive lifestyle and the availability of nonhealthy foods