Question 4 Not yet answered Marked out of 1.00 P Flag question You are infected

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Question 4 Not yet answered Marked out of 1.00 P Flag question You are infected with a bacterial disease. Your sister had this same illness last week, and took a full cycle of antibiotics. She quickly became better. You started taking the same antibiotic, but they had no effect. In fact, you had to return to the doctor after a week, because you did not feel better. Why did you remain sick after taking antibiotics, while your sister quickly recovered? Which is the most reasonable hypothesis? Select one: O a. The bacteria infecting you evolved to be resistant to the antibiotic (i.e. a genetic mutation for resistance occurred in a bacterial cell, it had a reproductive advantage and increased in the population). b. You developed a tolerance for the antibiotic (ie, you experienced a non-genetic change that made you less sensitive to the effects of the antibiotic). O c. The bacteria infecting you developed a tolerance for the antibiotic (i.e. individual bacteria experienced a non- genetic change that made them less sensitive to the effects of the antibiotic).

Explanation / Answer

The answer is option a.

Explanation: The use of antibiotics is to kill or inhibit the growth of the bacteria,everytime a bacteria grows and multiplies, it develops mutation in DNA,which makes them less susceptible to antibiotics, so every dose of antibiotic, would help bacteria in developing resisitance to antiobiotics by a cross resistance mechanism.

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