Final answer:
Beta-lactam antibiotics target peptidoglycan synthesis in bacterial cells. (Option 1).
Step-by-step explanation:
The target for beta-lactam antibiotics is peptidoglycan synthesis in bacterial cells.
Beta-lactam antibiotics such as penicillin and cephalosporin inhibit the activity of enzymes called penicillin-binding proteins (PBPs) which are involved in the synthesis of peptidoglycan, a major component of the bacterial cell wall.
By inhibiting peptidoglycan synthesis, beta-lactam antibiotics weaken and disrupt the bacterial cell wall, ultimately leading to cell death. Therefore, the correct option is 1) peptidoglycan synthesis