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antibiotic
antibiotic
1.
When was the first antibiotic—arsphenamine discovered?It was discovered by Paul Ehrlich in（）.
2.
After observing that bacteria took up toxic dyes, Paul Ehrlich discovered arsphenamine, the first antibiotic.
3.
Which of the following structures contains genes for enzymes and antibiotic resistance?
4.
Major factors contributing to the selective pressure for antibiotic resistant bacteria include all of the following EXCEPT