Semi-synthetic and extended-spectrum penicillins have proven more effective than natural penicillins for two of the following reasons: 1-Interfere more effectively with the development of the peptidoglycan layer in cell-walls 2-Are less sensitive to penicillinases than natural penicillins 3-Do not contain the b-lactam ring thus making them less susceptible to b-lactamases 4-Are less susceptible to the development of resistance 5-Have a broader spectrum of activity

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