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A student with Strep throat (caused by a strain of bacterium) is given a prescription for an antibiotic and is told to take the drug for two weeks. After a week, the student feels better and stops taking the drug. Two months later, the student again shows symptoms of Strep throat and decides to finish the leftover antibiotic rather than going to the doctor again. Two months later, the student develops Strep throat for a third time and returns to the doctor. This time, the antibiotic does not work. The doctor runs a test and discovers that the bacterial strain the student is carrying is antibiotic resistant. What most likely happened?A.Because the use of antibiotics lowers the effectiveness of the immune system, the student continually reinfected himself with the bacteria. The third time, the student happened to be reinfected with a resistant strain. B.When the student stopped taking the drug, a small number of bacteria-those that were more drug resistant-still survived in his body. Those bacteria repopulated his throat and over time, drug-resistant alleles became more common. C.The student must have eaten produce that had been genetically engineered with antibiotic-resistant genes. When he consumed them, the bacteria in the student's throat picked up these genes through horizontal gene transfer. D.The antibiotic caused mutations in the bacterium. The more exposure to the antibiotic, the more mutations. Even one random mutation can confer antibiotic resistance.
The given dipeptide is Asp-Tyr. Recognize the charge state for each structure at the given pH by adding the + or - charges to the appropriate functional groups and adding or removing hydrogen atoms to the structure where appropriate.
Suppose that you discover a new plant species that seems to survive under a wide variety of environmental conditions. Explain an effective, but low budget approach to discern.
Explain the process of Micturition, and describe the role of the autonomic nervous system as well as voluntary functions of the bladder.
What is an animal? Include in your answer how animals are differentiated from other life forms. In particular, describe the similarities and differences between volvocine protozoa, members of the Phylum Porifera, and members of the Phylum Cnidaria th..
Explain a muscle contraction beginning with the motor neuron to relaxation of the muscle. Discuss the physiological relationship of the muscular and skeletal system.
Explain three physiological differences you would expect betweem two combat- navie soldiers placed on the front line in a war zone if one was given a potent phenylethanolamine
While the nurse applies the sharp point of the pin on his arm several times, he is only able to identify these as one "very sharp prick." What would be the most correct explanation for this.
Explain in detail physiological basis of the usefulness of the polygraph test in order to ascertain a person's truthfulness in responding to questions. in addition, comment on the validity of this test.
When a tropical moth is touched on the thorax it lifts its forewings up abruptly, exposing its brightly coloured hind-wings. What causes the moth to behave this way? What significance can we attach to the fact that the verbal ability scores of ado..
A drug has a molec. weight of 200. Determine how many grams would you use to make 100 ml of a solution that is isotonic? Suppose that the diluent is distilled water and that the drug does not ionize in water.
Trypanosomses are not so young and widespread protozoa that humans have encountered for many years. Upon infection with T. brucei brucei, the organism is cleared.
He says that the mere presence of DNA is not sufficient to prove the point: his cells may have adopted DNA as a useful molecule quite independently of all other known life forms. What would you do to convince him that he was wrong.
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