G1 Phase: active transcription and translation, S Phase: replicated DNA, G2 phase: protein synthesis for proteins necessary to perform cell division.
During G1, cell is metabolically active and continuously grows but does not replicate its DNA.
In S phase, cell synthesizes a complete copy of the DNA in its nucleus and it also duplicates a microtubule-organizing structure called as centrosome. Centrosomes helps in separation of DNA during M phase.
In G2 phase, cell replenishes energy stores and synthesizes proteins necessary for chromosome manipulation.
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