When an antibiotic is first introduced, it is very effective for treating infect

Question

When an antibiotic is first introduced, it is very effective for treating infections. With increasing use of the antibiotic, the effectiveness declines and eventually the antibiotic fails to cure infection. The evolution of antibiotic resistance occurs because… * A)Human bodies become immune to the effects of the antibiotic and so we have to take more and more of it and eventually we are completely immune and the antibiotic no longer works B)Bacteria targeted by the antibiotic became stronger in response to exposure to the antibiotic. As a result, fewer and fewer of the bacteria die from the antibiotic C)There were one or a few bacterial cells that were able to survive in the presence of the antibiotic due to an existing mutation and these individuals reproduced D)The presence of the antibiotic caused bacteria to develop mutations that allowed them to resist the effects of the antibiotic. These individuals reproduced and the number of resistant bacteria increased When an antibiotic is first introduced, it is very effective for treating infections. With increasing use of the antibiotic, the effectiveness declines and eventually the antibiotic fails to cure infection. The evolution of antibiotic resistance occurs because… * A)Human bodies become immune to the effects of the antibiotic and so we have to take more and more of it and eventually we are completely immune and the antibiotic no longer works B)Bacteria targeted by the antibiotic became stronger in response to exposure to the antibiotic. As a result, fewer and fewer of the bacteria die from the antibiotic C)There were one or a few bacterial cells that were able to survive in the presence of the antibiotic due to an existing mutation and these individuals reproduced D)The presence of the antibiotic caused bacteria to develop mutations that allowed them to resist the effects of the antibiotic. These individuals reproduced and the number of resistant bacteria increased When an antibiotic is first introduced, it is very effective for treating infections. With increasing use of the antibiotic, the effectiveness declines and eventually the antibiotic fails to cure infection. The evolution of antibiotic resistance occurs because… * A)Human bodies become immune to the effects of the antibiotic and so we have to take more and more of it and eventually we are completely immune and the antibiotic no longer works B)Bacteria targeted by the antibiotic became stronger in response to exposure to the antibiotic. As a result, fewer and fewer of the bacteria die from the antibiotic C)There were one or a few bacterial cells that were able to survive in the presence of the antibiotic due to an existing mutation and these individuals reproduced D)The presence of the antibiotic caused bacteria to develop mutations that allowed them to resist the effects of the antibiotic. These individuals reproduced and the number of resistant bacteria increased

Explanation / Answer

Evolution of atibiotic resistance occured in human beings because, human body produces some defece mechanisms when the bacteria enter the body. In this process, immune system shows some response to bacteria.

In the presence of an antibiotic, most of the bacteria die. But bacteria produce some defence mechanisms by sendig out the atibiotic, by changing the antibiotic attack sites and by combating the atibiotic effect.

so, even the survival of a single bacterium due to the above mentioned defence mechanisms can lead to the formation of many bacteria and replaces all the dead bacteria .

A strong selective pressure is faced by the bacteria for their survival in the presence of an antibiotic. so bacteria develop resistance to antibiotic .

so the answer would be all of the above . Because all the above concepts are relavant to the concept of evolution of antibiotic resistance.

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