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Cell Cycle Question

Q. The most variable phase of cell cycle is..?
A. G1
B. S
C. G2
D. M

Correct answer A.  G1

G1 is considered as most variable phase of cell cycle because of its variation in time periods of different types of cell. Like mammalian cell in culture take about 10-12 hours whereas in zygotic cleavage it takes less then a hour. While the time taken by all others phases of cell cycle remains about constant.

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