Final answer:
Penicillin and cephalosporin are Beta-lactam antibiotics that inhibit cell wall synthesis and affect peptidoglycan synthesis, making them bactericidal.
Step-by-step explanation:
Penicillin and cephalosporin are antibiotics that inhibit cell wall synthesis and affect peptidoglycan synthesis. They belong to the class of antibiotics known as Beta-lactams. These antibiotics work by inhibiting the transpeptidase cross-linking activity of penicillin-binding proteins, which prevents the proper formation of the bacterial cell wall. As a result, the cell wall becomes weak and prone to bursting when water enters the cell. This mechanism of action makes Beta-lactams bactericidal, meaning they kill bacteria.