Biochemistry Basics – 28678

The correct sequence of the cell cycle is-

A. G_O-G₁-S-G₂-M

B. G_O-G1-G₂-S-M

C. G_O-M-G₂-S-G₁

D. G_O-G₁-S-M-G₂

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Correct Answer » A Explanation

Ans.A.
Cell Cycle

• In the G1 (gap 1) phase, the cell prepares for DNA synthesis.
• DNA synthesis occurs during the S (synthesis) phase of the cell cycle. During the S phase, DNA is completely replicated, but only once.
• Cell prepares for mitosis in the G₂ (gap 2) phase when proteins necessary for daughter cells are synthesized. Then the cell enters into the M (mitotic) phase when chromosomes are visible under the microscope. The whole cycle lasts about 24 hours; out of which M phase is only 1-2 hours.
• Those cells which are not in the division are said to be in the G₀ phase or resting phase.