Multiple choice

Florey and Chain’s experiments on mice led to which of the following conclusions?

  1. Penicillin has antibiotic properties

  2. Penicillin is ineffective as an antibiotic

  3. Penicillin is only effective against viruses

  4. Penicillin damages host cells
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A Correct answer
Explanation

Florey and Chain conducted experiments where they infected mice with lethal doses of Streptococcus bacteria and treated some of them with penicillin. The treated mice survived while the untreated ones died, demonstrating that penicillin has powerful antibiotic properties against bacterial infections.

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