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An antibiotic targets the 30s subunit of a bacterial ribosome. A mutation of what kind would be the most effective form of resistance?

A doctor has a patient who has a bacterial infection. The doctor takes a sample of the bacteria, purifies it and then uses antibiotic susceptibility testing to determine whether or not it responds to various antibiotics. Specifically, the doctor uses Kirby-Baur disc diffusion tests and determines that the bacteria are susceptible to Tetracycline. Which of the following would be the best way to use this information?

Penicillin was purified and mass produced for human medicine in the early 1940s. Resistance to the antibiotic was seen within a couple of years. In some cases, research has documented resistance to some antibiotics before the drugs are even used in medicine. Which of the following is the best explanation for these patterns of resistance?

Which of the following is not evidence for the use of penicillin or other mold products prior to Fleming’s experiment?

What was it called when the Allies were unwilling to abandon Berlin, so the United States, Great Britain, and France began to deliver all needed supplies to West Berlin by air to circumvent the Soviet blockade of the city?

What was it called when a Central High School in Little Rock, Arkansas, was forced to accept its first nine African American students, resulting in the Arkansas governor Orval Faubus ordering the state National Guard to prevent the students from attending classes?

This plan stipulated that the European nations had to work together in order to receive aid, thus enforcing unity through enticement, while seeking to undercut the political popularity of French and Italian Communists and dissuading moderates from forming coalition governments with them.

In which of the following Supreme Court cases did Thurgood Marshall, then chief counsel for the NAACP, successfully argued the landmark that the practice of segregation in public schools made African American students feel inferior, even if the facilities provided were equal in nature, the Court noted in its decision, the very fact that some students were separated from others on the basis of their race made segregation unconstitutional?

What did Winston Churchill say that had divided Europe into the “free” West and the Communist East controlled by the Soviet Union in a speech in 1946?

The 2nd Agricultural Revolution contributed to an ideal conditions for the Industrial Revolution.  New farming methods like crop rotation was important when __.