Bacterial Infections And Pain Behind Ear And Throat Pain Why Are Antibacterial Agents That Target The Cell Wall So Effective In Treating Bacterial Infections?

Why are antibacterial agents that target the cell wall so effective in treating bacterial infections? - bacterial infections and pain behind ear and throat pain

I need help with these problems, please!

1.) Why are antibacterial agents on the cell wall is effective in treating bacterial infections?
2.) Why are some bacteria are resistant to the activity of cell wall-active antibiotics?