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Q.
DNA duplication takes place during
CMC MedicalCMC Medical 2008
Solution:
A growing cell undergoes cell cycle that essentially consists of two periods, inter phase (I-phase), or resting phase and Mitotic phase (M-phase). Interphase comprises $ {{G}_{1}} $ (Gap 1), S (Synthesis) and $ {{G}_{2}} $ (Gap II) $ {{G}_{1}} $ is the period between the end of mitosis and start of S phase RNA and proteins are synthesized during this phase. S is the specific part of the interphase during, which DNA synthesis occurs or DNA is replicated in this phase. $ {{G}_{2}} $ period is the interval between the end of S-phase and start of mitosis. RNA and new proteins to be used for mitosis are synthesized. The decision of cell division occurs in $ {{G}_{1}} $ -phase. The cell would normally proceed to mitosis (M-phase) without interuption when it hasentered S-phase. Mitosis (M-phase) consists of division of nucleus or karyokinesis followed by division of cytoplasm or cytokinesis.