Bacteriophages were used by Hershey and Chase to further elucidate our understanding of heredity. Why were bacteriophages used?
What will be an ideal response?
Bacteriophages (phages) are viruses that are reasonably easy to manipulate in the laboratory. Further, it was known that they were composed of an outer coat of protein, and that they contained DNA. Using radioactive phosphorus to label the DNA, and radioactive sulfur to label the protein coat, they were able to show that it was the radioactively labeled DNA that entered the host cell (bacteria).
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Which of the following statement best describes the defining characteristics of members of the Class Testudines?
A. They lack teeth. B. They have a hard shell. C. They have a kinetic skull. D. They have both a hard shell and are lacking in teeth. E. They have both a kinetic skull and a hard shell.
The gradient distributions of alleles across continents reflect _____
a. the delineation of new races b. genetic drift c. human migration patterns d. protective alleles e. natural selection
Bacterial Strain A divides every 30 minutes. If you require at least 4 billion cells to perform an experiment, how many hours will you need to incubate a culture tube inoculated with a single cell of Bacteria A to get enough material to perform your experiment?
A. 8 B. 2 C. 16 D. 32 E. 4
Flowers frequented by insects are typically not ________ because insects cannot detect this color.
A. red B. white C. yellow D. blue