BI-1492
Antibiotics
Biology · Secondary 4 · Hard · Antibiotics
A student measures the diameters of clear zones around discs soaked in antibiotic X as 18 mm, 20 mm and 22 mm. Another antibiotic Y gives a mean clear zone of 15 mm. Which antibiotic is more effective at preventing bacterial growth and why?
- X, because it has a larger mean clear zone than Y
- X, because it has more discs than Y
- Y, because it has a smaller mean clear zone than X
- Y, because its clear zones are all the same size
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