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

Step 1: Understanding the Question
The task is to match the different phases of the eukaryotic cell cycle with the biological activities that occur during those specific times. The cell cycle is divided into interphase (G1, S, G2) and the M-phase (mitosis). Step 2: Key Formula or Approach
Analyze the specific roles of each phase: - G1: First gap, growth phase. - S: Synthesis phase, DNA replication. - G2: Second gap, preparation for mitosis. - M: Mitotic phase, division. Step 3: Detailed Explanation
A. G1 phase: This is the interval between mitosis and the start of DNA replication. The cell grows and remains metabolically active, but the DNA remains the same. Thus, A matches with II.
B. S phase: The "S" stands for Synthesis. During this phase, the DNA is replicated. The DNA content doubles (e.g., from 2C to 4C), though the chromosome number remains unchanged. Thus, B matches with III.
C. G2 phase: This is the second growth phase where the cell continues to grow and prepares for division by synthesizing specific proteins (like tubulin for spindle fibers). Thus, C matches with IV.
D. M phase: The "M" stands for Mitosis. This is the stage where the actual division of the nucleus and cytoplasm takes place. Thus, D matches with I.
Step 4: Final Answer
The correct combination is A-II, B-III, C-IV, D-I. This is represented by option (D).