Question

Match List I with List II regarding the phases of the cell cycle and their activities:

• A. A-II, B-III, C-IV, D-I
• B. A-IV, B-I, C-II, D-III
• C. A-III, B-IV, C-I, D-II
• D. A-I, B-II, C-III, D-IV

Hint:

Remember: \textbf{S} stands for \textbf{S}ynthesis (DNA), and \textbf{M} stands for \textbf{M}itosis (Division). $G_1$ is just "Growth 1" and $G_2$ is "Growth 2" plus protein prep!

Answer 1

The Correct Option is A

The cell cycle is divided into Interphase ($G_1, S, G_2$) and the M phase (Mitosis). Each stage has distinct metabolic and synthetic characteristics:
• $G_1$ Phase (Gap 1): This is the interval between mitosis and the initiation of DNA replication. During this phase, the cell is metabolically active and grows continuously but does not replicate its DNA yet.
• S Phase (Synthesis): This is the critical stage where DNA synthesis or replication takes place. The amount of DNA per cell doubles (from $2C$ to $4C$), though the chromosome number remains the same.
• $G_2$ Phase (Gap 2): During this phase, proteins (like tubulin for spindle fibers) are synthesized in preparation for mitosis while cell growth continues.
• M Phase (Mitosis): This is the most dramatic period of the cell cycle, representing the actual cell division where the components of the cell are reorganized and divided into two daughter cells.