This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: DNA Replication , Subject name: Biochemistry
DNA synthesis takes place in which phase of cell cycle - 
Select and explain. 
A. G1, B. S, C. G2, D. M
B: S
Answer: B: S 
Explanation: Ans. is 'b'i.e., S Cell cycleo In cell, the replication of the DNA occurs only at a specific time during the life of the cell. This period is referred to as the synthetic phase. The various phases of cell cycle are (in sequence) G0-G1-S-G2-M.# G1 : Presynthetic phaserinterval.S : Synthetic phase (DNA synthesis).G2. : Post synthetic phase/premitoic phase/interval.M : Mitotic phase : Cells are produced which either directly reenter next cycle or pass into non proliferative Go phase.G0 : Quiescent state.