Which of the following step in cell cycle is known as restriction point?: (A) G0 to G1, (B) G1 to S, (C) S to G2, (D) G2 TO M
Answer is B. Cells in G1 progress through the cycle and reach a critical stage at the G1/S transition, known as a restriction point, a rate limiting step for replication. Ref: Robbins 8th edition Chapter 3.