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Step 1 (for DNA replication) enzyme breaks the bonds between bases Step 2 (for DNA replication) bases pair up with the new bases Step 3 (for DNA replication) each DNA molecule contains one original and one new strand Interphase the first stage of the Cell Cycle; grows to mature size, DNA replication, prepares to divide Mitosis the second stage of the Cell cycle; contains the phases prophase, metaphase, anaphase, telaphase Prophase centrioles move to the opposite side, spindle fibers begin to stretch, nuclear membrane dissppears Metaphase double-stranded chromosomes line up, centromere becomes attached to spindle fiber Anaphase centromere divides, two strands seperate and move away Telaphase centrioles and spindle fibers fade away, nuclear membrane forms around chromsomes Cytokenisis cytoplasm divides, daugter cell has identical number of chromosomes as parent cell