New alleles that might allow a bacterium to become resistant to an antibiotic arise throughMultiple choice question.mutation.genetic drift.induction by the antibiotic.antibiotic alteration.

Because genes do not "know" when to mutate, it follows that bacterial species with a resistance to an antibiotic must have had a mutation ______ exposure to the antibiotic.Multiple choice question.caused byafterbefore

How does an antibiotic act as a selective agent in promoting bacterial resistance?Multiple ChoiceAntibiotics are designed to selectively kill some bacteria while promoting the survival of all others.Exposure to a specific antibiotic causes a mutation that allows the affected bacteria to survive and reproduce, passing the mutation to future generations.Bacteria with a random mutation that allows resistance to that antibiotic are able to survive exposure and reproduce, passing the resistance mutation on to subsequent generations of bacteria.A specific antibiotic selects favorable mutations that promote susceptibility to that antibiotic.

Describe what antibiotic resistance is and explain how it develops in a population of bacteria.

In this experiment, the bacteria stopped spreading when they reached an area with a higher concentration of antibiotics. Remember that there are millions of bacteria and that they reproduce very quickly. After a while, a new "mutant" population can be seen fanning out from a single point.Using the concepts from this lesson, explain how this new population with higher antibiotic resistance arises.

Which sequence shows the most likely way the bacteria develop this resistance?Question response areaSelect one optionvariation in gene → struggle to survive → natural selection natural selection → struggle to survive → variation in genenatural selection → variation in gene → struggle to survivestruggle to survive → variation in gene → natural selection