why is peptidoglycan synthesis inportant in antibiotic activity? why do antibiotics not interfere with cell wall synthesis in the host cells?

Which of the following does NOT describe a mechanism of antibiotic resistance among bacteria? enzymes to hydrolyze or chemically alter the antibiotics mutations in target molecules so that antibiotics can no longer bind efflux pumps cell wall diffusion barrier, e.g. Gram-negative outer membrane, Acid Fast cell wall of Mycobacterium O increased synthesis of porins to increase antibiotic diffusion across membranes

What are the bacterial cell targets of the different antibiotics?

Which bacteria produce β-lactamase enzyme which is resistant to penicillin and why?