Normal cellular processes during the S phase of the cell cycle.
Explanation:
Antimetabolites are drugs that affect one or more enzymes which are important for DNA synthesis by acting as a substitute to the main metabolites that would be used in the normal metabolism.
Antimetabolites also act during the S phase of the cell cycle thereby contributing to cell destruction.
While Antineoplastic antibiotic agents interfere with one or more stages of the synthesis of RNA, DNA, or both which prevent normal cell growth and reproduction of the cell.
Let's say you enjoy swimming. One day you decide to swim alone. But it's a risky idea because you could drown and no one would be there to help you in time. So it's best to have others around incase you have an accident or need help.