If the clonal selection theory is correct, there exists at least one lymphocyte capable of synthesizing an antibody specific to each antigen prior to exposure to the antigen.
Answer the following statement true (T) or false (F)
True
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In formation of plaques by bacteriophages which of the following statements is true?
A. A plaque is the result of several different viruses initially infecting a single cell B. The plaque is the result of a single virus that has replicated in many bacterial cells in a localized area C. A plaque results when a single virus infects one cell and then does not infect any other cell D. Plaques are the areas where cells have not been infected at all
Which of the following mutations will not alter the amount of genetic material on the chromosomes?
A. duplication B. inversion C. simple translocation D. deficiency E. inversion and simple translocation
The bacterium Neisseria gonorrhoeae causes the sexually-transmitted infection gonorrhea. Although it can be isolated from the vagina, there are numerous normal biota in that location as well. To generate a pure culture of this pathogenic bacterium, the best choice is a(n) ________.
A. selective medium B. enrichment medium C. differential medium D. liquid medium
Viruses that infect bacteria are:
a. Not known to exist b. Prions c. Bacteriophages d. Composed of protein only e. Also capable of causing disease in humans