Question

Select the phases which are included in the 'Interphase'.
A. S phase
B. M phase
C. G₁ phase
D. G₂ phase
Choose the correct answer from the options given below:

• A. A, B and D only
• B. B and D only
• C. A, C and D only
• D. B, C and D only

Hint:

Think of the cell cycle as a life story. \textbf{Interphase} is the long period of "living, growing, and preparing" (G₁, S, G₂). \textbf{M phase} is the short, dramatic event of "reproduction" or division. M phase is never part of Interphase.

Answer 1

The Correct Option is C

Step 1: Concept Overview:
The question requires identifying the phases that constitute the 'Interphase' stage of the eukaryotic cell cycle, which is the series of events leading to cell division and duplication.
Step 2: Detailed Breakdown:
The eukaryotic cell cycle is primarily divided into two stages:

Interphase: The longest phase, involving cell growth and DNA replication in preparation for division. It's subdivided into:

G₁ phase (Gap 1): (C) Cell growth and synthesis of mRNA and proteins for DNA synthesis.
S phase (Synthesis): (A) DNA replication, resulting in chromosomes with two sister chromatids.
G₂ phase (Gap 2): (D) Continued cell growth and production of proteins/organelles for mitosis.

M phase (Mitotic phase): (B) The cell division phase, including mitosis (nuclear division) and cytokinesis (cytoplasmic division).
Thus, Interphase comprises the G₁, S, and G₂ phases. The M phase is a separate, subsequent division stage.
Step 3: Conclusion:
Interphase includes the S phase (A), G₁ phase (C), and G₂ phase (D). Therefore, the correct option is A, C and D only.