Evolution WU - Antibiotic REsistance

Interpret the Graph A bacterium known as Staphylococcus aureus (shown below) infected a patient on July 20, 2013. The patient visited a hospital for treatment and was prescribed antibiotics to kill the bacteria. Which interpretation best explains the above graph? Doctors applied three antibiotics, and after each use of an antibiotic, the bacterial population would become resistant until the patient died. Doctors applied three antibiotics, and they eventually worked, successfully defeating the bacterial population. The antibiotics were totally useless because the bacteria never suffered from population declines. The patient recovered fully from his infection. Which primary mechanism of evolution is taking place in our population of bacteria? Migration – resistant bacteria moved within his body to uninfected places Natural Selection – resistant bacteria survived and passed on their resistance gene to future generations Non-random Mating – bacteria selected mates that improved their offspring survivability Infinitely large population – bacterial population was too big to be treated by an antibiotic What adaptation determined which bacteria survived and reproduced? Metabolism of glucose allowed the population to grow quickly and outcompete Sexual reproduction created variation in the bacterial pouplation Random genetic mutation that made the bacteria resistant to antibiotics The antibiotic caused a mutation in the bacteria How could bacteria evolve so quickly over such a short period of time? Bacteria produce many generations in a short period of time Many different species of bacteria were present in the patient World travelers carry bacteria around the globe Bacteria have a high surface-area-to-volume ratio Public health officials estimate that 50% of antibiotic use is inappropriate. Why is it important not to take an antibiotic when you don’t really need to take it? Overusing and misusing antibiotics causes natural selection to give rise to bacteria resistant to the antibiotic.