Question

The total length of the cell cycle of XDR cells in a cell culture is 27 hours. M phase is found to De 1 hour. S phase is found to be 9 hours and G2 is found to be 5.5 hours. How long is G1?

A. 24 hours
B. 9.5 hours
C. 9 hours
D. 11.5 hours
E. 4.5 hours

Answer 1

To find the G1 phase duration, subtract the total durations of M, S, and G2 phases from the complete cell cycle length. The length of the G1 phase is 11.5 hours.

Step-by-step explanation:

The total length of the cell cycle for XDR cells is given as 27 hours. To find the duration of the G1 phase, one must subtract the lengths of the other phases (M, S, and G2) from the total cycle length. Given that M phase lasts 1 hour, S phase is 9 hours, and G2 is 5.5 hours, we can calculate the length of G1 as follows:

27 hours (total cell cycle) - 1 hour (M phase) - 9 hours (S phase) - 5.5 hours (G2 phase) = 11.5 hours.

Therefore, the length of the G1 phase is 11.5 hours, which corresponds to option D.