These data are from experiments in which bacteriophage DNA and protein were labeled with radioactive tracers and allowed to infect bacteria. The virus–bacteria mixtures were whirled in a blender to dislodge the viruses, and the tracers were tracked inside and outside of the bacteria. DNA contains much more phosphorus than do proteins; proteins contain much more sulfur than does DNA. The results
imply that:
1.equal amounts of bacteriophage protein and DNA entered the infected bacteria
2.more protein entered the bacteria
3.more DNA entered the bacteria
4.neither protein nor DNA entered the bacteria
3
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Adulthood and mating of helminths occur in which host?
A. Primary host B. Transport host C. Definitive host D. Secondary host E. Mating occurs in all hosts.
The most important aspect of agar that makes it a useful ingredient for solidifying media for bacterial culture is
A. It provides an excellent carbon and energy source for bacteria. B. Bacteria are unable to break it down so it stays solidified. C. It melts at 100oC and solidifies at temperatures below 50oC. D. It provides an excellent nitrogen source for bacteria.
If all the following DNA fragments were analyzed on an electrophoresis gel, which one would migrate farthest from the negative electrode?
A. 5000 base pairs B. 750 base pairs C. 1000 base pairs D. 250 base pairs E. 2500 base pairs
The form of nitrogen most likely to be absorbed from the soil by plants is
A. nucleic acids. B. nitrogenous wastes. C. nitrous oxide gas. D. nitrogen gas. E. nitrite/nitrate ions.