Question

--- stage of cell cycle is most active in terms of gene action.
A. M phase
B. G\[1\] phase
C. S phase
D. G\[2\] phase

Answer 1

Hint: The cell cycle is characterized as a series of events that occur intravenously in a cell and result in the creation of two daughter cells through DNA replication and cytokinesis, as well as the division of cell organelles. The cell cycle of eukaryotic cells is divided into two distinct phases: interphase and mitotic phase. It is split up into the M phase, G\[1\] phase, S phase and G\[2\] phase.

Complete solution:
Option A: Phase M (Mitotic)
The G\[2\] process takes its place after this one. The cell splits into two daughter cells with an identical number of chromosomes distributed between them.
So, option A is correct.
Option B: Phase \[1\] (Gap\[1\])
This is the first stage of the interphase, also known as the G\[1\] or first gap phase, in which minor modifications are detected due to the cell's biochemical hyperactivity.
So, option B is incorrect.
Option C: Synthesis (S) phase
The interphase is in the midst of active DNA and histone synthesis.
So, option C is incorrect.
Option D: G\[2\] (Gap\[2\]) phase
The S process comes after this phase. Since the chromosomes are divided into two chromatids, the cell contains double the amount of DNA.
So, option D is incorrect.

Hence, Option A is the correct answer.

Note:
The cell division cycle, also known as the cell cycle, is a four-stage mechanism in which a somatic cell undergoes two major molecular processes: parent chromosome replication (which occurs in S phase) and equivalent chromosome detachment from daughter cells (occurring during M phase). The cell cycle of eukaryotic cells is divided into two distinct phases: interphase and mitotic phase. As the cell expands and replicates a DNA copy during interphase, the cell divides the DNA into two sets during the mitotic phase, resulting in the division of the cytoplasm into two daughter cells.