Question

The stage during which, cell decides to get specialized

• A. $S$-phase
• B. $M$-phase
• C. $G_1$ -phase
• D. $G_2$ -phase

Answer 1

Answer: (C)

The cell cycle is the process by which cells reproduce themselves along with their genetic material, ie, nuclear DNA. The four phases of the cell cycle are $G_1,S,G_2$ and $M$.
[a] $G_1$-phase (first gap phase before DNA replication)?Cell gets decide to differentiate during $G_1$-phase. The differentiated cells that no longer divide are arrested usually in $G_1$ phase, such a type of phase is called $G_0$-phase, set on next phase as appropriate.
[b] $S$-phase (synthesis phase)?DNA replication occurs. Protein molecules called histones are synthesized and cover each DNA strand. Each chromosome divides into two chromatids. At this stage the cell is $4n$.
[c] $G_2$-phase (second gap phase before mitosis) ? intensive cellular synthesis mitochondria and chloroplasts divide, energy store increase, mitotic begin to form. [d] $M$-phase (mitotic phase)? nuclear division in four stages and cytoplasmic division.