The DNA is replicated in the stage of the cell cycle called interphase. Interphase is the first and the longest phase of the cell cycle.Also during interphase, the centrioles … get copied. 1  The Five Major Parts of the Brain At its most basic, the brain controls the body.he DNA is replicated in the stage of the cell cycle called interphase. Interphase is the first and the longest phase of the cell cycle.