Which tree of the North American eastern
forests has had its population decimated by a
fungal disease?
a. chestnut
b. maple
c. oak
d. eastern pine
e. dogwood
A
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The transposon "sleeping beauty" is:
A. a transposon from fish that was reactivated by mutation. B. a transposon from fish that was reactivated by introducing a plasmid that had a functional transposase. C. an artificially constructed transposon based on sequence comparisons of numerous inactive Tc1/mariner transposons. D. a retrotransposon of humans. E. a complex transposon that can move from cell to cell.
In a molecule of methane, CH4, each hydrogen atom shares an orbital with the carbon atom. The total
number of shared electrons in CH4 is ____.
a. 4 b. 2 c. 1 d. 8 e. 5
Aseptic technique is a standard lab practice that includes all of the following EXCEPT __________.
a. elimination of all oxygen during any processes to prevent contamination b. preventing contamination of unwanted microbes present on solids, in liquids, and in the air c. preventing airborne contaminants from accessing nutrient-rich environments in culture d. using careful methods to sterilize equipment used to transfer and isolate colonies
A case study. Epidemiologists were working on tracing an infectious disease outbreak. They traced all of the cases back to a specific movie theater, at a specific time, where the index patient saw a movie. Very few of the 34 cases that became infected at the theater ate or drank while watching the movie with the index patient. What do you suppose was the mode of transmission for this infectious disease?
A) Inhalation B) Ingestion C) Direct body contact