BI-1471
Antibiotics
Biology · Secondary 4 · Medium · Antibiotics
In an investigation of antibiotics, a student places discs soaked in distilled water on a bacterial lawn as a control. After incubation, there is no clear zone around these discs.
What is the main purpose of including the distilled water discs?
What is the main purpose of including the distilled water discs?
- To kill all bacteria on the agar
- To show that the paper discs and water alone do not inhibit bacteria
- To increase the growth rate of the bacteria
- To change the pH of the agar jelly
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