Which microscope visualizes specimens coated with a thin layer of metal?
a. transmission electron microscope
b. scanning electron microscope
c. fluorescence microscope
d. phase-contrast microscope
e. compound microscope
ANSWER: b
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Diseases can be controlled through immunization even if the percentage of the population that is immunized is less than 100% because
A) vectors can be controlled through other means. B) most diseases lack reservoirs. C) of herd immunity. D) vehicles can be sterilized.
Which of the following statements are true regarding bacteria in the human body? Select all correct choices
A. Human bodies can contain pathogenic bacteria, but these are often kept in check by other (non-pathogenic) species. B. Human bodies can actually contain bacteria that are beneficial to certain processes (e.g., digestion). C. The TB-causing bacteria M. tuberculosis is present (but dormant) in many human bodies.
What kind of phylogenetic tree shows relationships, but not lineage, between species?
What will be an ideal response?
Of the following fermentation pathways, which can be carried out by human muscle cells?
A) alcoholic B) butanediol C) lactic acid: homolactic D) lactic acid: heterolactic E) mixed acid