Which of the following statements is true of selective toxicity?
A. Selective toxicity takes advantage of structural similarities between host and pathogen.
B. To be effective, an antimicrobial agent must be more toxic to the patient than the pathogen.
C. Selective toxicity takes advantage of differences in metabolic rates of the host and pathogen.
D. Selective toxicity damages only pathogenic bacteria and not beneficial bacteria.
E. Selective toxicity takes advantage of structural and/or metabolic differences between host and pathogen.
Answer: E
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A. lytigate B. temperate C. virulent D. intemperate
Predict what would happen as the entropy of a system approaches 100%
A) All motion would stop. B) Randomness would become maximized. C) Order would become maximized. D) Heat would decrease.
You are working in the field with your favorite bacteria species, Bacterium BB. You carry out some experiments with Bacterium BB, and find that it can now degrade toluene and it is pathogenic! What happened?
A. Bacterium BB was transformed with a resistance plasmid and a digestive plasmid. B. Bacterium BB acquired degradative and virulence plasmids by horizontal gene transfer. C. Bacterium BB was exposed to a bacteriophage which is now in its lytic phase. D. Bacterium BB sexually reproduced with another strain of bacteria that had both toluene-degrading gene and virulence gene. E. Bacterium BB picked up fertility and Col-plasmids via conjugation.
How many cross-over events are depicted in the following figure?
a. zero b. one c. two d. four e. five