Antibiotics usage

Directions
Based on the knowledge that you learned in the last three weeks, if you could develop an antibiotic what would be its characteristics? Key points to remember:

Spectrum of coverage
Resistance patterns
Structure of bacteria
Disease processes
Propose three hypotheses for why an antibiotic might not be effective. These should also explain why the ineffectiveness of the antibiotic results in failure to treat the disease. Use references for your answer.