Biology

Biology, 27.09.2019 13:00, jjmage2206

Which of these best describes why certain bacteria have become resistant to penicillin?

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Chemistry, 29.06.2019 05:00, OceanClaws

Doctors have fought infections with penicillin for over 50 years. recently, penicillin has not worked as well as before. which of the following explanations can account for this observation? a. some bacteria are resistant to the drug. the continued use of the drug has killed all of these bacteria. b. penicillin use has made all bacteria resistant to it. c. some bacteria are resistant to penicillin. the continued use of the drug has killed all but these bacteria. d. bacteria eat penicillin, so it is not effective anymore.

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Biology, 01.07.2019 23:00, menagirl71953

Which of these best describes why certain bacteria have become resistant to penicillin? a) the penicillin in the 1970's was much weaker that the penicillin used today, thus it was not as effective. b) penicillin was not effective in treating any bacterial diseases, so the doctors had to find new treatments. c) these new bacterial strains came out of the jungles and forests already equipped to be penicillin-resistant. d) penicillin was so heavily prescribed by doctors that it led to certain, more fit, strains of bacteria to be able to survive.

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Biology, 28.07.2019 18:30, corbinfisher

Penicillin (an antibiotic that kills some bacteria) came into widespread use in the 1940s. by the 1990s, several different species of bacteria were already resistant to the effects of penicillin, and it can no longer be used to treat certain diseases. what is the most likely explanation for this?

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Biology, 16.09.2019 19:30, martinhannaheovgtjp

In 1967 a penicillin-resistant pneumonia, caused by streptococcus pneumoniae and called pneumococcus, surfaced in a remote village in papua, new guinea. at about the same time american military personnel in southeast asia were acquiring penicillin-resistant gonorrhea from prostitutes. by 1976, when the soldiers had come home, they brought the new strain of gonorrhea with them and physicians had to find new drugs to treat it. in 1983 a hospital-acquired intestinal infection caused by the bacterium enterococcus faecium joined the list of bacteria that could not be killed by penicillin.which of these best describes why certain bacteria have become resistant to penicillin?

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