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12. Approximately 10% of people living in the United States are allergic to penicillin. A research team has
developed a new antibiotic that could potentially replace penicillin and treat a wide variety of bacterial
infections. To test their theory, the scientists grow Streptococcus pyogenes in petri dishes. S. pyogenes
causes numerous infections in humans, like pharyngitis, tonsillitis, and scarlet fever. These diseases are
normally treated successfully with penicillin. They expose S. pyogenes to their new strain of antibiotic to
determine its effectiveness. What are good positive and negative controls?

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Oseni

A good positive control will be another antibiotic and a good negative control will be a placebo.

What are positive and negative controls?

In experiments, positive controls are treatments with known results. Negative controls, on the other hand, are placebos. Placebos are not expected to produce any result.

Both positive and negative controls are used on the control subjects during experiments to form the basis for comparison with the effects of the independent variable.

Thus, in this case, since the independent variable is the new antibiotic, a positive control would be a known antibiotic that is effective against S. pyogenes. A negative control will be any other substance that produces no effect whatsoever on the organism.

More on experimental controls can be found here: https://brainly.com/question/23389356

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