Describe the effects of the various antibiotic drugs you used. Were they all equally effective at controlling bacterial growth? How do you know?

Basically, most antibiotic drugs are not effective in controlling bacterial growth. The potency of any antibiotic drugs is a measure of the magnitude of diameter of the bacterial growth. This is because the diameter is the measurement of the bacterial growth around the antibiotic drugs used to control it multiplication, and therefore a measure of how effective it can controls the population Thus a small diameter around the antibiotic agent is a proof that it suppressed the growth effectively and can effectively be used to control the bacteria, While a large diameter is an indication of low effectiveness of the drug.

Based on this analogy, penicillin with wide usage for control of bacteria growth with diameter of 3mm, is the most effective antibiotic drugs. However, Erythromycin which is also widely used control growth with diameter of 5mm or 6mm depending on type of bacterial.

Therefore, the least 3mm diameter presented by penicillin is an indication that, antibiotic drugs are not effective enough, and further research need to be done to control growth of bacteria and therefore its pathogenic effects.