system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Which parts of cell cycle are fixed in durationa) GIb) G2c) Sd) M
assistant
The correct answer is  The time taken for S, G2 and M phases are similar for most cell types, occupying about 6, 4 and 2 hours respectively whereas the duration of G1 shows considerable variation as short as 2 hours in rapidly dividing cells i.e., embryonic tissue or longer than 12 hours in some adult tissue.