Answer: Body cells do not have cell wall.
Explanation: Antibiotics are the group of medicines that kills the bacteria that has invaded the human body and caused infection in the body.
Antibiotics kills only bacterial cells and does not affects the normal cell of human body because human cells do not have cell walls but bacteria has cell wall.
Example: An antibiotic named penicillin works by preventing the cell wall formation in the bacteria and ultimately the bacteria cell dies.
Also the bacterial cell and human cell are different in structure and the machinery that is used to build proteins is also different in both the cells.
By recognizing the bacterial cell and killing it is the correct way by which antibiotics work.