A) S-phase
B) M-phase
C) \[{{G}_{1}}\]-phase
D) \[{{G}_{2}}\]-phase
Correct Answer: C
Solution :
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.
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