$(1)$ Definition / Explanation: Cell cycle
$(2)$ Definition / Explanation: Interphase

(N/A) $(1)$ The sequence of events by which a cell duplicates its genome,synthesizes the other constituents of the cell,and eventually divides into two daughter cells is called the cell cycle.
$(2)$ Interphase is the phase between two successive $M$ phases. It is the period of preparation where the cell undergoes growth,$DNA$ replication,and synthesis of required materials for the subsequent cell division.