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Overuse of antibiotics has caused antibiotic resistance in some bacteria in a population. Which statement describes the most likely impact of natural selection on the bacterial population?
A strain of bacteria has been effectively treated by penicillin for many years. Lately, the drug has not been completely able to destroy it. What has been the result of evolution that has taken place with the bacteria?
MRSA, an antibiotic-resistant strain of bacteria, has recently become a problem in some schools. How can the germ theory of disease best help schools contain an outbreak?
Which statement best describes how antibiotics affect cellular homeostasis?
A researcher sprays a new pesticide on thousands of insects of the same species that live in a large field. A few of the insects survive. What can be concluded by the researcher?
The outer covering of a bacteria cell is called the
The following graph shows the number of insects present on a field after it has been sprayed with the same insecticide once a year over four years.
What is the most reasonable hypothesis for the increase in insects seen in year four?
During natural selection, the organisms with the best adaptations..
Some bacteria, sometimes called “super bugs”, have developed a resistance to certain antibiotics. How does drug resistance develop in bacteria?
Genetic variation can aid in the survival of species when the environment changes. Which of the following is the best example of an organism with a genetic variation that could improve survival chances over time?
Bacteria are called _____ because their DNA is not contained in a nucleus.
The three main shapes of bacteria are all of the following EXCEPT