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 replication occurs in which phase of cell cycle? 
Select and explain. 
A. G1 phase, B. S phase, C. G2 phase, D. M phase
B: S phase
Answer: B: S phase 
Explanation: ANSWER: (B) S phaseREF: Ganong's physiology 22nd ed chapter 1"S or synthetic phase of cell cycle is the one in which replication of DNA OCCURS.